influxql

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Published: Dec 19, 2017 License: MIT Imports: 24 Imported by: 0

README

The Influx Query Language Specification

Introduction

This is a reference for the Influx Query Language ("InfluxQL").

InfluxQL is a SQL-like query language for interacting with InfluxDB. It has been lovingly crafted to feel familiar to those coming from other SQL or SQL-like environments while providing features specific to storing and analyzing time series data.

Notation

The syntax is specified using Extended Backus-Naur Form ("EBNF"). EBNF is the same notation used in the Go programming language specification, which can be found here. Not so coincidentally, InfluxDB is written in Go.

Production  = production_name "=" [ Expression ] "." .
Expression  = Alternative { "|" Alternative } .
Alternative = Term { Term } .
Term        = production_name | token [ "…" token ] | Group | Option | Repetition .
Group       = "(" Expression ")" .
Option      = "[" Expression "]" .
Repetition  = "{" Expression "}" .

Notation operators in order of increasing precedence:

|   alternation
()  grouping
[]  option (0 or 1 times)
{}  repetition (0 to n times)

Comments

Both single and multiline comments are supported. A comment is treated the same as whitespace by the parser.

-- single line comment
/*
    multiline comment
*/

Single line comments will skip all text until the scanner hits a newline. Multiline comments will skip all text until the end comment marker is hit. Nested multiline comments are not supported so the following does not work:

/* /* this does not work */ */

Query representation

Characters

InfluxQL is Unicode text encoded in UTF-8.

newline             = /* the Unicode code point U+000A */ .
unicode_char        = /* an arbitrary Unicode code point except newline */ .

Letters and digits

Letters are the set of ASCII characters plus the underscore character _ (U+005F) is considered a letter.

Only decimal digits are supported.

letter              = ascii_letter | "_" .
ascii_letter        = "A" … "Z" | "a" … "z" .
digit               = "0" … "9" .

Identifiers

Identifiers are tokens which refer to database names, retention policy names, user names, measurement names, tag keys, and field keys.

The rules:

  • double quoted identifiers can contain any unicode character other than a new line
  • double quoted identifiers can contain escaped " characters (i.e., \")
  • double quoted identifiers can contain InfluxQL keywords
  • unquoted identifiers must start with an upper or lowercase ASCII character or "_"
  • unquoted identifiers may contain only ASCII letters, decimal digits, and "_"
identifier          = unquoted_identifier | quoted_identifier .
unquoted_identifier = ( letter ) { letter | digit } .
quoted_identifier   = `"` unicode_char { unicode_char } `"` .
Examples:
cpu
_cpu_stats
"1h"
"anything really"
"1_Crazy-1337.identifier>NAME👍"

Keywords

ALL           ALTER         ANY           AS            ASC           BEGIN
BY            CREATE        CONTINUOUS    DATABASE      DATABASES     DEFAULT
DELETE        DESC          DESTINATIONS  DIAGNOSTICS   DISTINCT      DROP
DURATION      END           EVERY         EXPLAIN       FIELD         FOR
FROM          GRANT         GRANTS        GROUP         GROUPS        IN
INF           INSERT        INTO          KEY           KEYS          KILL
LIMIT         SHOW          MEASUREMENT   MEASUREMENTS  NAME          OFFSET
ON            ORDER         PASSWORD      POLICY        POLICIES      PRIVILEGES
QUERIES       QUERY         READ          REPLICATION   RESAMPLE      RETENTION
REVOKE        SELECT        SERIES        SET           SHARD         SHARDS
SLIMIT        SOFFSET       STATS         SUBSCRIPTION  SUBSCRIPTIONS TAG
TO            USER          USERS         VALUES        WHERE         WITH
WRITE

Literals

Integers

InfluxQL supports decimal integer literals. Hexadecimal and octal literals are not currently supported.

int_lit             = [ "+" | "-" ] ( "1" … "9" ) { digit } .
Floats

InfluxQL supports floating-point literals. Exponents are not currently supported.

float_lit           = [ "+" | "-" ] ( "." digit { digit } | digit { digit } "." { digit } ) .
Strings

String literals must be surrounded by single quotes. Strings may contain ' characters as long as they are escaped (i.e., \').

string_lit          = `'` { unicode_char } `'` .
Durations

Duration literals specify a length of time. An integer literal followed immediately (with no spaces) by a duration unit listed below is interpreted as a duration literal.

Duration units
Units Meaning
u or µ microseconds (1 millionth of a second)
ms milliseconds (1 thousandth of a second)
s second
m minute
h hour
d day
w week
duration_lit        = int_lit duration_unit .
duration_unit       = "u" | "µ" | "ms" | "s" | "m" | "h" | "d" | "w" .
Dates & Times

The date and time literal format is not specified in EBNF like the rest of this document. It is specified using Go's date / time parsing format, which is a reference date written in the format required by InfluxQL. The reference date time is:

InfluxQL reference date time: January 2nd, 2006 at 3:04:05 PM

time_lit            = "2006-01-02 15:04:05.999999" | "2006-01-02" .
Booleans
bool_lit            = TRUE | FALSE .
Regular Expressions
regex_lit           = "/" { unicode_char } "/" .

Comparators: =~ matches against !~ doesn't match against

Note: Use regular expressions to match measurements and tags. You cannot use regular expressions to match databases, retention policies, or fields.

Queries

A query is composed of one or more statements separated by a semicolon.

query               = statement { ";" statement } .

statement           = alter_retention_policy_stmt |
                      create_continuous_query_stmt |
                      create_database_stmt |
                      create_retention_policy_stmt |
                      create_subscription_stmt |
                      create_user_stmt |
                      delete_stmt |
                      drop_continuous_query_stmt |
                      drop_database_stmt |
                      drop_measurement_stmt |
                      drop_retention_policy_stmt |
                      drop_series_stmt |
                      drop_shard_stmt |
                      drop_subscription_stmt |
                      drop_user_stmt |
                      grant_stmt |
                      kill_query_statement |
                      show_continuous_queries_stmt |
                      show_databases_stmt |
                      show_field_keys_stmt |
                      show_grants_stmt |
                      show_measurements_stmt |
                      show_queries_stmt |
                      show_retention_policies |
                      show_series_stmt |
                      show_shard_groups_stmt |
                      show_shards_stmt |
                      show_subscriptions_stmt|
                      show_tag_keys_stmt |
                      show_tag_values_stmt |
                      show_users_stmt |
                      revoke_stmt |
                      select_stmt .

Statements

ALTER RETENTION POLICY
alter_retention_policy_stmt  = "ALTER RETENTION POLICY" policy_name on_clause
                               retention_policy_option
                               [ retention_policy_option ]
                               [ retention_policy_option ]
                               [ retention_policy_option ] .

Replication factors do not serve a purpose with single node instances.

Examples:
-- Set default retention policy for mydb to 1h.cpu.
ALTER RETENTION POLICY "1h.cpu" ON "mydb" DEFAULT

-- Change duration and replication factor.
ALTER RETENTION POLICY "policy1" ON "somedb" DURATION 1h REPLICATION 4
CREATE CONTINUOUS QUERY
create_continuous_query_stmt = "CREATE CONTINUOUS QUERY" query_name on_clause
                               [ "RESAMPLE" resample_opts ]
                               "BEGIN" select_stmt "END" .

query_name                   = identifier .

resample_opts                = (every_stmt for_stmt | every_stmt | for_stmt) .
every_stmt                   = "EVERY" duration_lit
for_stmt                     = "FOR" duration_lit
Examples:
-- selects from DEFAULT retention policy and writes into 6_months retention policy
CREATE CONTINUOUS QUERY "10m_event_count"
ON "db_name"
BEGIN
  SELECT count("value")
  INTO "6_months"."events"
  FROM "events"
  GROUP BY time(10m)
END;

-- this selects from the output of one continuous query in one retention policy and outputs to another series in another retention policy
CREATE CONTINUOUS QUERY "1h_event_count"
ON "db_name"
BEGIN
  SELECT sum("count") as "count"
  INTO "2_years"."events"
  FROM "6_months"."events"
  GROUP BY time(1h)
END;

-- this customizes the resample interval so the interval is queried every 10s and intervals are resampled until 2m after their start time
-- when resample is used, at least one of "EVERY" or "FOR" must be used
CREATE CONTINUOUS QUERY "cpu_mean"
ON "db_name"
RESAMPLE EVERY 10s FOR 2m
BEGIN
  SELECT mean("value")
  INTO "cpu_mean"
  FROM "cpu"
  GROUP BY time(1m)
END;
CREATE DATABASE
create_database_stmt = "CREATE DATABASE" db_name
                       [ WITH
                           [ retention_policy_duration ]
                           [ retention_policy_replication ]
                           [ retention_policy_shard_group_duration ]
                           [ retention_policy_name ]
                       ] .

Replication factors do not serve a purpose with single node instances.

Examples:
-- Create a database called foo
CREATE DATABASE "foo"

-- Create a database called bar with a new DEFAULT retention policy and specify the duration, replication, shard group duration, and name of that retention policy
CREATE DATABASE "bar" WITH DURATION 1d REPLICATION 1 SHARD DURATION 30m NAME "myrp"

-- Create a database called mydb with a new DEFAULT retention policy and specify the name of that retention policy
CREATE DATABASE "mydb" WITH NAME "myrp"
CREATE RETENTION POLICY
create_retention_policy_stmt = "CREATE RETENTION POLICY" policy_name on_clause
                               retention_policy_duration
                               retention_policy_replication
                               [ retention_policy_shard_group_duration ]
                               [ "DEFAULT" ] .

Replication factors do not serve a purpose with single node instances.

Examples
-- Create a retention policy.
CREATE RETENTION POLICY "10m.events" ON "somedb" DURATION 60m REPLICATION 2

-- Create a retention policy and set it as the DEFAULT.
CREATE RETENTION POLICY "10m.events" ON "somedb" DURATION 60m REPLICATION 2 DEFAULT

-- Create a retention policy and specify the shard group duration.
CREATE RETENTION POLICY "10m.events" ON "somedb" DURATION 60m REPLICATION 2 SHARD DURATION 30m
CREATE SUBSCRIPTION

Subscriptions tell InfluxDB to send all the data it receives to Kapacitor or other third parties.

create_subscription_stmt = "CREATE SUBSCRIPTION" subscription_name "ON" db_name "." retention_policy "DESTINATIONS" ("ANY"|"ALL") host { "," host} .
Examples:
-- Create a SUBSCRIPTION on database 'mydb' and retention policy 'autogen' that send data to 'example.com:9090' via UDP.
CREATE SUBSCRIPTION "sub0" ON "mydb"."autogen" DESTINATIONS ALL 'udp://example.com:9090'

-- Create a SUBSCRIPTION on database 'mydb' and retention policy 'autogen' that round robins the data to 'h1.example.com:9090' and 'h2.example.com:9090'.
CREATE SUBSCRIPTION "sub0" ON "mydb"."autogen" DESTINATIONS ANY 'udp://h1.example.com:9090', 'udp://h2.example.com:9090'
CREATE USER
create_user_stmt = "CREATE USER" user_name "WITH PASSWORD" password
                   [ "WITH ALL PRIVILEGES" ] .
Examples:
-- Create a normal database user.
CREATE USER "jdoe" WITH PASSWORD '1337password'

-- Create an admin user.
-- Note: Unlike the GRANT statement, the "PRIVILEGES" keyword is required here.
CREATE USER "jdoe" WITH PASSWORD '1337password' WITH ALL PRIVILEGES

Note: The password string must be wrapped in single quotes.

DELETE
delete_stmt = "DELETE" ( from_clause | where_clause | from_clause where_clause ) .
Examples:
DELETE FROM "cpu"
DELETE FROM "cpu" WHERE time < '2000-01-01T00:00:00Z'
DELETE WHERE time < '2000-01-01T00:00:00Z'
DROP CONTINUOUS QUERY
drop_continuous_query_stmt = "DROP CONTINUOUS QUERY" query_name on_clause .
Example:
DROP CONTINUOUS QUERY "myquery" ON "mydb"
DROP DATABASE
drop_database_stmt = "DROP DATABASE" db_name .
Example:
DROP DATABASE "mydb"
DROP MEASUREMENT
drop_measurement_stmt = "DROP MEASUREMENT" measurement .
Examples:
-- drop the cpu measurement
DROP MEASUREMENT "cpu"
DROP RETENTION POLICY
drop_retention_policy_stmt = "DROP RETENTION POLICY" policy_name on_clause .
Example:
-- drop the retention policy named 1h.cpu from mydb
DROP RETENTION POLICY "1h.cpu" ON "mydb"
DROP SERIES
drop_series_stmt = "DROP SERIES" ( from_clause | where_clause | from_clause where_clause ) .
Example:
DROP SERIES FROM "telegraf"."autogen"."cpu" WHERE cpu = 'cpu8'

DROP SHARD
drop_shard_stmt = "DROP SHARD" ( shard_id ) .
Example:
DROP SHARD 1
DROP SUBSCRIPTION
drop_subscription_stmt = "DROP SUBSCRIPTION" subscription_name "ON" db_name "." retention_policy .
Example:
DROP SUBSCRIPTION "sub0" ON "mydb"."autogen"
DROP USER
drop_user_stmt = "DROP USER" user_name .
Example:
DROP USER "jdoe"
GRANT

NOTE: Users can be granted privileges on databases that do not exist.

grant_stmt = "GRANT" privilege [ on_clause ] to_clause .
Examples:
-- grant admin privileges
GRANT ALL TO "jdoe"

-- grant read access to a database
GRANT READ ON "mydb" TO "jdoe"
KILL QUERY
kill_query_statement = "KILL QUERY" query_id .
Examples:
--- kill a query with the query_id 36
KILL QUERY 36

NOTE: Identify the query_id from the SHOW QUERIES output.

SHOW CONTINUOUS QUERIES
show_continuous_queries_stmt = "SHOW CONTINUOUS QUERIES" .
Example:
-- show all continuous queries
SHOW CONTINUOUS QUERIES
SHOW DATABASES
show_databases_stmt = "SHOW DATABASES" .
Example:
-- show all databases
SHOW DATABASES
SHOW FIELD KEYS
show_field_keys_stmt = "SHOW FIELD KEYS" [ from_clause ] .
Examples:
-- show field keys and field value data types from all measurements
SHOW FIELD KEYS

-- show field keys and field value data types from specified measurement
SHOW FIELD KEYS FROM "cpu"
SHOW GRANTS
show_grants_stmt = "SHOW GRANTS FOR" user_name .
Example:
-- show grants for jdoe
SHOW GRANTS FOR "jdoe"
SHOW MEASUREMENTS
show_measurements_stmt = "SHOW MEASUREMENTS" [ with_measurement_clause ] [ where_clause ] [ limit_clause ] [ offset_clause ] .
Examples:
-- show all measurements
SHOW MEASUREMENTS

-- show measurements where region tag = 'uswest' AND host tag = 'serverA'
SHOW MEASUREMENTS WHERE "region" = 'uswest' AND "host" = 'serverA'

-- show measurements that start with 'h2o'
SHOW MEASUREMENTS WITH MEASUREMENT =~ /h2o.*/
SHOW QUERIES
show_queries_stmt = "SHOW QUERIES" .
Example:
-- show all currently-running queries
SHOW QUERIES
SHOW RETENTION POLICIES
show_retention_policies = "SHOW RETENTION POLICIES" on_clause .
Example:
-- show all retention policies on a database
SHOW RETENTION POLICIES ON "mydb"
SHOW SERIES
show_series_stmt = "SHOW SERIES" [ from_clause ] [ where_clause ] [ limit_clause ] [ offset_clause ] .
Example:
SHOW SERIES FROM "telegraf"."autogen"."cpu" WHERE cpu = 'cpu8'
SHOW SHARD GROUPS
show_shard_groups_stmt = "SHOW SHARD GROUPS" .
Example:
SHOW SHARD GROUPS
SHOW SHARDS
show_shards_stmt = "SHOW SHARDS" .
Example:
SHOW SHARDS
SHOW SUBSCRIPTIONS
show_subscriptions_stmt = "SHOW SUBSCRIPTIONS" .
Example:
SHOW SUBSCRIPTIONS
SHOW TAG KEYS
show_tag_keys_stmt = "SHOW TAG KEYS" [ from_clause ] [ where_clause ] [ group_by_clause ]
                     [ limit_clause ] [ offset_clause ] .
Examples:
-- show all tag keys
SHOW TAG KEYS

-- show all tag keys from the cpu measurement
SHOW TAG KEYS FROM "cpu"

-- show all tag keys from the cpu measurement where the region key = 'uswest'
SHOW TAG KEYS FROM "cpu" WHERE "region" = 'uswest'

-- show all tag keys where the host key = 'serverA'
SHOW TAG KEYS WHERE "host" = 'serverA'
SHOW TAG VALUES
show_tag_values_stmt = "SHOW TAG VALUES" [ from_clause ] with_tag_clause [ where_clause ]
                       [ group_by_clause ] [ limit_clause ] [ offset_clause ] .
Examples:
-- show all tag values across all measurements for the region tag
SHOW TAG VALUES WITH KEY = "region"

-- show tag values from the cpu measurement for the region tag
SHOW TAG VALUES FROM "cpu" WITH KEY = "region"

-- show tag values across all measurements for all tag keys that do not include the letter c
SHOW TAG VALUES WITH KEY !~ /.*c.*/

-- show tag values from the cpu measurement for region & host tag keys where service = 'redis'
SHOW TAG VALUES FROM "cpu" WITH KEY IN ("region", "host") WHERE "service" = 'redis'
SHOW USERS
show_users_stmt = "SHOW USERS" .
Example:
-- show all users
SHOW USERS
REVOKE
revoke_stmt = "REVOKE" privilege [ on_clause ] "FROM" user_name .
Examples:
-- revoke admin privileges from jdoe
REVOKE ALL PRIVILEGES FROM "jdoe"

-- revoke read privileges from jdoe on mydb
REVOKE READ ON "mydb" FROM "jdoe"
SELECT
select_stmt = "SELECT" fields from_clause [ into_clause ] [ where_clause ]
              [ group_by_clause ] [ order_by_clause ] [ limit_clause ]
              [ offset_clause ] [ slimit_clause ] [ soffset_clause ]
              [ timezone_clause ] .
Examples:
-- select mean value from the cpu measurement where region = 'uswest' grouped by 10 minute intervals
SELECT mean("value") FROM "cpu" WHERE "region" = 'uswest' GROUP BY time(10m) fill(0)

-- select from all measurements beginning with cpu into the same measurement name in the cpu_1h retention policy
SELECT mean("value") INTO "cpu_1h".:MEASUREMENT FROM /cpu.*/

-- select from measurements grouped by the day with a timezone
SELECT mean("value") FROM "cpu" GROUP BY region, time(1d) fill(0) tz("America/Chicago")

Clauses

from_clause     = "FROM" measurements .

group_by_clause = "GROUP BY" dimensions fill(fill_option).

into_clause     = "INTO" ( measurement | back_ref ).

limit_clause    = "LIMIT" int_lit .

offset_clause   = "OFFSET" int_lit .

slimit_clause   = "SLIMIT" int_lit .

soffset_clause  = "SOFFSET" int_lit .

timezone_clause = tz(string_lit) .

on_clause       = "ON" db_name .

order_by_clause = "ORDER BY" sort_fields .

to_clause       = "TO" user_name .

where_clause    = "WHERE" expr .

with_measurement_clause = "WITH MEASUREMENT" ( "=" measurement | "=~" regex_lit ) .

with_tag_clause = "WITH KEY" ( "=" tag_key | "!=" tag_key | "=~" regex_lit | "IN (" tag_keys ")"  ) .

Expressions

binary_op        = "+" | "-" | "*" | "/" | "%" | "&" | "|" | "^" | "AND" |
                   "OR" | "=" | "!=" | "<>" | "<" | "<=" | ">" | ">=" .

expr             = unary_expr { binary_op unary_expr } .

unary_expr       = "(" expr ")" | var_ref | time_lit | string_lit | int_lit |
                   float_lit | bool_lit | duration_lit | regex_lit .

Other

alias            = "AS" identifier .

back_ref         = ( policy_name ".:MEASUREMENT" ) |
                   ( db_name "." [ policy_name ] ".:MEASUREMENT" ) .

db_name          = identifier .

dimension        = expr .

dimensions       = dimension { "," dimension } .

field_key        = identifier .

field            = expr [ alias ] .

fields           = field { "," field } .

fill_option      = "null" | "none" | "previous" | "linear" | int_lit | float_lit .

host             = string_lit .

measurement      = measurement_name |
                   ( policy_name "." measurement_name ) |
                   ( db_name "." [ policy_name ] "." measurement_name ) .

measurements     = measurement { "," measurement } .

measurement_name = identifier | regex_lit .

password         = string_lit .

policy_name      = identifier .

privilege        = "ALL" [ "PRIVILEGES" ] | "READ" | "WRITE" .

query_id         = int_lit .

query_name       = identifier .

retention_policy = identifier .

retention_policy_option      = retention_policy_duration |
                               retention_policy_replication |
                               retention_policy_shard_group_duration |
                               "DEFAULT" .

retention_policy_duration    = "DURATION" duration_lit .

retention_policy_replication = "REPLICATION" int_lit .

retention_policy_shard_group_duration = "SHARD DURATION" duration_lit .

retention_policy_name = "NAME" identifier .

series_id        = int_lit .

shard_id         = int_lit .

sort_field       = field_key [ ASC | DESC ] .

sort_fields      = sort_field { "," sort_field } .

subscription_name = identifier .

tag_key          = identifier .

tag_keys         = tag_key { "," tag_key } .

user_name        = identifier .

var_ref          = measurement .

Query Engine Internals

Once you understand the language itself, it's important to know how these language constructs are implemented in the query engine. This gives you an intuitive sense for how results will be processed and how to create efficient queries.

The life cycle of a query looks like this:

  1. InfluxQL query string is tokenized and then parsed into an abstract syntax tree (AST). This is the code representation of the query itself.

  2. The AST is passed to the QueryExecutor which directs queries to the appropriate handlers. For example, queries related to meta data are executed by the meta service and SELECT statements are executed by the shards themselves.

  3. The query engine then determines the shards that match the SELECT statement's time range. From these shards, iterators are created for each field in the statement.

  4. Iterators are passed to the emitter which drains them and joins the resulting points. The emitter's job is to convert simple time/value points into the more complex result objects that are returned to the client.

Understanding Iterators

Iterators are at the heart of the query engine. They provide a simple interface for looping over a set of points. For example, this is an iterator over Float points:

type FloatIterator interface {
    Next() (*FloatPoint, error)
}

These iterators are created through the IteratorCreator interface:

type IteratorCreator interface {
    CreateIterator(m *Measurement, opt IteratorOptions) (Iterator, error)
}

The IteratorOptions provide arguments about field selection, time ranges, and dimensions that the iterator creator can use when planning an iterator. The IteratorCreator interface is used at many levels such as the Shards, Shard, and Engine. This allows optimizations to be performed when applicable such as returning a precomputed COUNT().

Iterators aren't just for reading raw data from storage though. Iterators can be composed so that they provided additional functionality around an input iterator. For example, a DistinctIterator can compute the distinct values for each time window for an input iterator. Or a FillIterator can generate additional points that are missing from an input iterator.

This composition also lends itself well to aggregation. For example, a statement such as this:

SELECT MEAN(value) FROM cpu GROUP BY time(10m)

In this case, MEAN(value) is a MeanIterator wrapping an iterator from the underlying shards. However, if we can add an additional iterator to determine the derivative of the mean:

SELECT DERIVATIVE(MEAN(value), 20m) FROM cpu GROUP BY time(10m)
Understanding Auxiliary Fields

Because InfluxQL allows users to use selector functions such as FIRST(), LAST(), MIN(), and MAX(), the engine must provide a way to return related data at the same time with the selected point.

For example, in this query:

SELECT FIRST(value), host FROM cpu GROUP BY time(1h)

We are selecting the first value that occurs every hour but we also want to retrieve the host associated with that point. Since the Point types only specify a single typed Value for efficiency, we push the host into the auxiliary fields of the point. These auxiliary fields are attached to the point until it is passed to the emitter where the fields get split off to their own iterator.

Built-in Iterators

There are many helper iterators that let us build queries:

  • Merge Iterator - This iterator combines one or more iterators into a single new iterator of the same type. This iterator guarantees that all points within a window will be output before starting the next window but does not provide ordering guarantees within the window. This allows for fast access for aggregate queries which do not need stronger sorting guarantees.

  • Sorted Merge Iterator - This iterator also combines one or more iterators into a new iterator of the same type. However, this iterator guarantees time ordering of every point. This makes it slower than the MergeIterator but this ordering guarantee is required for non-aggregate queries which return the raw data points.

  • Limit Iterator - This iterator limits the number of points per name/tag group. This is the implementation of the LIMIT & OFFSET syntax.

  • Fill Iterator - This iterator injects extra points if they are missing from the input iterator. It can provide null points, points with the previous value, or points with a specific value.

  • Buffered Iterator - This iterator provides the ability to "unread" a point back onto a buffer so it can be read again next time. This is used extensively to provide lookahead for windowing.

  • Reduce Iterator - This iterator calls a reduction function for each point in a window. When the window is complete then all points for that window are output. This is used for simple aggregate functions such as COUNT().

  • Reduce Slice Iterator - This iterator collects all points for a window first and then passes them all to a reduction function at once. The results are returned from the iterator. This is used for aggregate functions such as DERIVATIVE().

  • Transform Iterator - This iterator calls a transform function for each point from an input iterator. This is used for executing binary expressions.

  • Dedupe Iterator - This iterator only outputs unique points. It is resource intensive so it is only used for small queries such as meta query statements.

Call Iterators

Function calls in InfluxQL are implemented at two levels. Some calls can be wrapped at multiple layers to improve efficiency. For example, a COUNT() can be performed at the shard level and then multiple CountIterators can be wrapped with another CountIterator to compute the count of all shards. These iterators can be created using NewCallIterator().

Some iterators are more complex or need to be implemented at a higher level. For example, the DERIVATIVE() needs to retrieve all points for a window first before performing the calculation. This iterator is created by the engine itself and is never requested to be created by the lower levels.

Subqueries

Subqueries are built on top of iterators. Most of the work involved in supporting subqueries is in organizing how data is streamed to the iterators that will process the data.

The final ordering of the stream has to output all points from one series before moving to the next series and it also needs to ensure those points are printed in order. So there are two separate concepts we need to consider when creating an iterator: ordering and grouping.

When an inner query has a different grouping than the outermost query, we still need to group together related points into buckets, but we do not have to ensure that all points from one buckets are output before the points in another bucket. In fact, if we do that, we will be unable to perform the grouping for the outer query correctly. Instead, we group all points by the outermost query for an interval and then, within that interval, we group the points for the inner query. For example, here are series keys and times in seconds (fields are omitted since they don't matter in this example):

cpu,host=server01 0
cpu,host=server01 10
cpu,host=server01 20
cpu,host=server01 30
cpu,host=server02 0
cpu,host=server02 10
cpu,host=server02 20
cpu,host=server02 30

With the following query:

SELECT mean(max) FROM (SELECT max(value) FROM cpu GROUP BY host, time(20s)) GROUP BY time(20s)

The final grouping keeps all of the points together which means we need to group server01 with server02. That means we output the points from the underlying engine like this:

cpu,host=server01 0
cpu,host=server01 10
cpu,host=server02 0
cpu,host=server02 10
cpu,host=server01 20
cpu,host=server01 30
cpu,host=server02 20
cpu,host=server02 30

Within each one of those time buckets, we calculate the max() value for each unique host so the output stream gets transformed to look like this:

cpu,host=server01 0
cpu,host=server02 0
cpu,host=server01 20
cpu,host=server02 20

Then we can process the mean() on this stream of data instead and it will be output in the correct order. This is true of any order of grouping since grouping can only go from more specific to less specific.

When it comes to ordering, unordered data is faster to process, but we always need to produce ordered data. When processing a raw query with no aggregates, we need to ensure data coming from the engine is ordered so the output is ordered. When we have an aggregate, we know one point is being emitted for each interval and will always produce ordered output. So for aggregates, we can take unordered data as the input and get ordered output. Any ordered data as input will always result in ordered data so we just need to look at how an iterator processes unordered data.

raw query selector (without group by time) selector (with group by time) aggregator
ordered input ordered output ordered output ordered output ordered output
unordered input unordered output unordered output ordered output ordered output

Since we always need ordered output, we just need to work backwards and determine which pattern of input gives us ordered output. If both ordered and unordered input produce ordered output, we prefer unordered input since it is faster.

There are also certain aggregates that require ordered input like median() and percentile(). These functions will explicitly request ordered input. It is also important to realize that selectors that are grouped by time are the equivalent of an aggregator. It is only selectors without a group by time that are different.

Documentation

Overview

Package influxql implements a parser for the InfluxDB query language.

InfluxQL is a DML and DDL language for the InfluxDB time series database. It provides the ability to query for aggregate statistics as well as create and configure the InfluxDB server.

See https://docs.influxdata.com/influxdb/latest/query_language/ for a reference on using InfluxQL.

Index

Constants

View Source
const (
	// Unknown primitive data type.
	Unknown DataType = 0
	// Float means the data type is a float.
	Float = 1
	// Integer means the data type is an integer.
	Integer = 2
	// String means the data type is a string of text.
	String = 3
	// Boolean means the data type is a boolean.
	Boolean = 4
	// Time means the data type is a time.
	Time = 5
	// Duration means the data type is a duration of time.
	Duration = 6
	// Tag means the data type is a tag.
	Tag = 7
	// AnyField means the data type is any field.
	AnyField = 8
)
View Source
const (
	// MinTime is used as the minimum time value when computing an unbounded range.
	// This time is one less than the MinNanoTime so that the first minimum
	// time can be used as a sentinel value to signify that it is the default
	// value rather than explicitly set by the user.
	MinTime = models.MinNanoTime - 1

	// MaxTime is used as the maximum time value when computing an unbounded range.
	// This time is 2262-04-11 23:47:16.854775806 +0000 UTC
	MaxTime = models.MaxNanoTime
)
View Source
const (
	// DateFormat represents the format for date literals.
	DateFormat = "2006-01-02"

	// DateTimeFormat represents the format for date time literals.
	DateTimeFormat = "2006-01-02 15:04:05.999999"
)
View Source
const (
	// DefaultQueryTimeout is the default timeout for executing a query.
	// A value of zero will have no query timeout.
	DefaultQueryTimeout = time.Duration(0)
)
View Source
const DefaultStatsInterval = 10 * time.Second

DefaultStatsInterval is the default value for IteratorEncoder.StatsInterval.

View Source
const (
	// WarningLevel is the message level for a warning.
	WarningLevel = "warning"
)
View Source
const ZeroTime = int64(math.MinInt64)

ZeroTime is the Unix nanosecond timestamp for no time. This time is not used by the query engine or the storage engine as a valid time.

Variables

View Source
var (
	// ErrInvalidQuery is returned when executing an unknown query type.
	ErrInvalidQuery = errors.New("invalid query")

	// ErrNotExecuted is returned when a statement is not executed in a query.
	// This can occur when a previous statement in the same query has errored.
	ErrNotExecuted = errors.New("not executed")

	// ErrQueryInterrupted is an error returned when the query is interrupted.
	ErrQueryInterrupted = errors.New("query interrupted")

	// ErrQueryAborted is an error returned when the query is aborted.
	ErrQueryAborted = errors.New("query aborted")

	// ErrQueryEngineShutdown is an error sent when the query cannot be
	// created because the query engine was shutdown.
	ErrQueryEngineShutdown = errors.New("query engine shutdown")

	// ErrQueryTimeoutLimitExceeded is an error when a query hits the max time allowed to run.
	ErrQueryTimeoutLimitExceeded = errors.New("query-timeout limit exceeded")
)
View Source
var ErrInvalidDuration = errors.New("invalid duration")

ErrInvalidDuration is returned when parsing a malformed duration.

View Source
var (
	// ErrInvalidTime is returned when the timestamp string used to
	// compare against time field is invalid.
	ErrInvalidTime = errors.New("invalid timestamp string")
)
View Source
var ErrUnknownCall = errors.New("unknown call")

ErrUnknownCall is returned when operating on an unknown function call.

Functions

func AggregateBooleanPoints added in v0.11.0

func AggregateBooleanPoints(a BooleanPointAggregator, points []BooleanPoint)

AggregateBooleanPoints feeds a slice of BooleanPoint into an aggregator. If the aggregator is a BooleanBulkPointAggregator, it will use the AggregateBulk method.

func AggregateFloatPoints added in v0.11.0

func AggregateFloatPoints(a FloatPointAggregator, points []FloatPoint)

AggregateFloatPoints feeds a slice of FloatPoint into an aggregator. If the aggregator is a FloatBulkPointAggregator, it will use the AggregateBulk method.

func AggregateIntegerPoints added in v0.11.0

func AggregateIntegerPoints(a IntegerPointAggregator, points []IntegerPoint)

AggregateIntegerPoints feeds a slice of IntegerPoint into an aggregator. If the aggregator is a IntegerBulkPointAggregator, it will use the AggregateBulk method.

func AggregateStringPoints added in v0.11.0

func AggregateStringPoints(a StringPointAggregator, points []StringPoint)

AggregateStringPoints feeds a slice of StringPoint into an aggregator. If the aggregator is a StringBulkPointAggregator, it will use the AggregateBulk method.

func BinaryExprName added in v0.11.0

func BinaryExprName(expr *BinaryExpr) string

BinaryExprName returns the name of a binary expression by concatenating the variables in the binary expression with underscores.

func BooleanCountReduce added in v0.11.0

func BooleanCountReduce(prev *IntegerPoint, curr *BooleanPoint) (int64, int64, []interface{})

BooleanCountReduce returns the count of points.

func BooleanFirstReduce added in v0.11.0

func BooleanFirstReduce(prev, curr *BooleanPoint) (int64, bool, []interface{})

BooleanFirstReduce returns the first point sorted by time.

func BooleanLastReduce added in v0.11.0

func BooleanLastReduce(prev, curr *BooleanPoint) (int64, bool, []interface{})

BooleanLastReduce returns the first point sorted by time.

func BooleanMaxReduce added in v0.13.0

func BooleanMaxReduce(prev, curr *BooleanPoint) (int64, bool, []interface{})

BooleanMaxReduce returns the minimum value between prev & curr.

func BooleanMinReduce added in v0.13.0

func BooleanMinReduce(prev, curr *BooleanPoint) (int64, bool, []interface{})

BooleanMinReduce returns the minimum value between prev & curr.

func ContainsVarRef added in v0.11.0

func ContainsVarRef(expr Expr) bool

ContainsVarRef returns true if expr is a VarRef or contains one.

func DrainIterator added in v0.13.0

func DrainIterator(itr Iterator)

DrainIterator reads and discards all points from itr.

func DrainIterators added in v0.13.0

func DrainIterators(itrs []Iterator)

DrainIterators reads and discards all points from itrs.

func ErrDatabaseNotFound added in v0.11.0

func ErrDatabaseNotFound(name string) error

ErrDatabaseNotFound returns a database not found error for the given database name.

func ErrMaxConcurrentQueriesLimitExceeded added in v1.1.0

func ErrMaxConcurrentQueriesLimitExceeded(n, limit int) error

ErrMaxConcurrentQueriesLimitExceeded is an error when a query cannot be run because the maximum number of queries has been reached.

func ErrMaxSelectPointsLimitExceeded added in v1.1.0

func ErrMaxSelectPointsLimitExceeded(n, limit int) error

ErrMaxSelectPointsLimitExceeded is an error when a query hits the maximum number of points.

func Eval

func Eval(expr Expr, m map[string]interface{}) interface{}

Eval evaluates expr against a map.

func EvalBool added in v0.9.5

func EvalBool(expr Expr, m map[string]interface{}) bool

EvalBool evaluates expr and returns true if result is a boolean true. Otherwise returns false.

func FieldDimensions added in v1.2.0

func FieldDimensions(sources Sources, m FieldMapper) (fields map[string]DataType, dimensions map[string]struct{}, err error)

func FloatCountReduce added in v0.11.0

func FloatCountReduce(prev *IntegerPoint, curr *FloatPoint) (int64, int64, []interface{})

FloatCountReduce returns the count of points.

func FloatFirstReduce added in v0.11.0

func FloatFirstReduce(prev, curr *FloatPoint) (int64, float64, []interface{})

FloatFirstReduce returns the first point sorted by time.

func FloatLastReduce added in v0.11.0

func FloatLastReduce(prev, curr *FloatPoint) (int64, float64, []interface{})

FloatLastReduce returns the last point sorted by time.

func FloatMaxReduce added in v0.11.0

func FloatMaxReduce(prev, curr *FloatPoint) (int64, float64, []interface{})

FloatMaxReduce returns the maximum value between prev & curr.

func FloatMinReduce added in v0.11.0

func FloatMinReduce(prev, curr *FloatPoint) (int64, float64, []interface{})

FloatMinReduce returns the minimum value between prev & curr.

func FloatSumReduce added in v0.11.0

func FloatSumReduce(prev, curr *FloatPoint) (int64, float64, []interface{})

FloatSumReduce returns the sum prev value & curr value.

func FormatDuration

func FormatDuration(d time.Duration) string

FormatDuration formats a duration to a string.

func HasTimeExpr added in v0.9.5

func HasTimeExpr(expr Expr) bool

HasTimeExpr returns true if the expression has a time term.

func IdentNeedsQuotes

func IdentNeedsQuotes(ident string) bool

IdentNeedsQuotes returns true if the ident string given would require quotes.

func IntegerCountReduce added in v0.11.0

func IntegerCountReduce(prev, curr *IntegerPoint) (int64, int64, []interface{})

IntegerCountReduce returns the count of points.

func IntegerFirstReduce added in v0.11.0

func IntegerFirstReduce(prev, curr *IntegerPoint) (int64, int64, []interface{})

IntegerFirstReduce returns the first point sorted by time.

func IntegerLastReduce added in v0.11.0

func IntegerLastReduce(prev, curr *IntegerPoint) (int64, int64, []interface{})

IntegerLastReduce returns the last point sorted by time.

func IntegerMaxReduce added in v0.11.0

func IntegerMaxReduce(prev, curr *IntegerPoint) (int64, int64, []interface{})

IntegerMaxReduce returns the maximum value between prev & curr.

func IntegerMinReduce added in v0.11.0

func IntegerMinReduce(prev, curr *IntegerPoint) (int64, int64, []interface{})

IntegerMinReduce returns the minimum value between prev & curr.

func IntegerSumReduce added in v0.11.0

func IntegerSumReduce(prev, curr *IntegerPoint) (int64, int64, []interface{})

IntegerSumReduce returns the sum prev value & curr value.

func IsRegexOp

func IsRegexOp(t Token) bool

IsRegexOp returns true if the operator accepts a regex operand.

func IsSelector added in v1.2.0

func IsSelector(expr Expr) bool

func IsSystemName added in v0.11.0

func IsSystemName(name string) bool

IsSystemName returns true if name is an internal system name.

func MatchSource

func MatchSource(sources Sources, name string) string

MatchSource returns the source name that matches a field name. It returns a blank string if no sources match.

func OnlyTimeExpr added in v0.9.5

func OnlyTimeExpr(expr Expr) bool

OnlyTimeExpr returns true if the expression only has time constraints.

func ParseDuration

func ParseDuration(s string) (time.Duration, error)

ParseDuration parses a time duration from a string. This is needed instead of time.ParseDuration because this will support the full syntax that InfluxQL supports for specifying durations including weeks and days.

func QuoteIdent

func QuoteIdent(segments ...string) string

QuoteIdent returns a quoted identifier from multiple bare identifiers.

func QuoteString

func QuoteString(s string) string

QuoteString returns a quoted string.

func Sanitize added in v0.13.0

func Sanitize(query string) string

Sanitize attempts to sanitize passwords out of a raw query. It looks for patterns that may be related to the SET PASSWORD and CREATE USER statements and will redact the password that should be there. It will attempt to redact information from common invalid queries too, but it's not guaranteed to succeed on improper queries.

This function works on the raw query and attempts to retain the original input as much as possible.

func ScanBareIdent

func ScanBareIdent(r io.RuneScanner) string

ScanBareIdent reads bare identifier from a rune reader.

func ScanDelimited

func ScanDelimited(r io.RuneScanner, start, end rune, escapes map[rune]rune, escapesPassThru bool) ([]byte, error)

ScanDelimited reads a delimited set of runes

func ScanString

func ScanString(r io.RuneScanner) (string, error)

ScanString reads a quoted string from a rune reader.

func StringCountReduce added in v0.11.0

func StringCountReduce(prev *IntegerPoint, curr *StringPoint) (int64, int64, []interface{})

StringCountReduce returns the count of points.

func StringFirstReduce added in v0.11.0

func StringFirstReduce(prev, curr *StringPoint) (int64, string, []interface{})

StringFirstReduce returns the first point sorted by time.

func StringLastReduce added in v0.11.0

func StringLastReduce(prev, curr *StringPoint) (int64, string, []interface{})

StringLastReduce returns the first point sorted by time.

func TimeRange

func TimeRange(expr Expr, loc *time.Location) (min, max time.Time, err error)

TimeRange returns the minimum and maximum times specified by an expression. It returns zero times if there is no bound.

func TimeRangeAsEpochNano added in v0.9.2

func TimeRangeAsEpochNano(expr Expr) (min, max int64, err error)

TimeRangeAsEpochNano returns the minimum and maximum times, as epoch nano, specified by an expression. If there is no lower bound, the minimum time is returned for minimum. If there is no higher bound, the maximum time is returned.

func Walk

func Walk(v Visitor, node Node)

Walk traverses a node hierarchy in depth-first order.

func WalkFunc

func WalkFunc(node Node, fn func(Node))

WalkFunc traverses a node hierarchy in depth-first order.

Types

type AlterRetentionPolicyStatement

type AlterRetentionPolicyStatement struct {
	// Name of policy to alter.
	Name string

	// Name of the database this policy belongs to.
	Database string

	// Duration data written to this policy will be retained.
	Duration *time.Duration

	// Replication factor for data written to this policy.
	Replication *int

	// Should this policy be set as defalut for the database?
	Default bool

	// Duration of the Shard.
	ShardGroupDuration *time.Duration
}

AlterRetentionPolicyStatement represents a command to alter an existing retention policy.

func (*AlterRetentionPolicyStatement) DefaultDatabase added in v1.1.5

func (s *AlterRetentionPolicyStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*AlterRetentionPolicyStatement) RequiredPrivileges

func (s *AlterRetentionPolicyStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute an AlterRetentionPolicyStatement.

func (*AlterRetentionPolicyStatement) String

String returns a string representation of the alter retention policy statement.

type Authorizer added in v1.3.0

type Authorizer interface {
	// AuthorizeDatabase indicates whether the given Privilege is authorized on the database with the given name.
	AuthorizeDatabase(p Privilege, name string) bool

	// AuthorizeQuery returns an error if the query cannot be executed
	AuthorizeQuery(database string, query *Query) error

	// AuthorizeSeriesRead determines if a series is authorized for reading
	AuthorizeSeriesRead(database string, measurement []byte, tags models.Tags) bool

	// AuthorizeSeriesWrite determines if a series is authorized for writing
	AuthorizeSeriesWrite(database string, measurement []byte, tags models.Tags) bool
}

Authorizer reports whether certain operations are authorized.

type AuxIterator added in v0.11.0

type AuxIterator interface {
	Iterator

	// Auxilary iterator
	Iterator(name string, typ DataType) Iterator

	// Start starts writing to the created iterators.
	Start()

	// Backgrounds the iterator so that, when start is called, it will
	// continuously read from the iterator.
	Background()
}

AuxIterator represents an iterator that can split off separate auxiliary iterators.

func NewAuxIterator added in v0.11.0

func NewAuxIterator(input Iterator, opt IteratorOptions) AuxIterator

NewAuxIterator returns a new instance of AuxIterator.

type BinaryExpr

type BinaryExpr struct {
	Op  Token
	LHS Expr
	RHS Expr
}

BinaryExpr represents an operation between two expressions.

func (*BinaryExpr) String

func (e *BinaryExpr) String() string

String returns a string representation of the binary expression.

type BooleanBulkPointAggregator added in v0.11.0

type BooleanBulkPointAggregator interface {
	AggregateBooleanBulk(points []BooleanPoint)
}

BooleanBulkPointAggregator aggregates multiple points at a time.

type BooleanDistinctReducer added in v0.13.0

type BooleanDistinctReducer struct {
	// contains filtered or unexported fields
}

BooleanDistinctReducer returns the distinct points in a series.

func NewBooleanDistinctReducer added in v0.13.0

func NewBooleanDistinctReducer() *BooleanDistinctReducer

NewBooleanDistinctReducer creates a new BooleanDistinctReducer.

func (*BooleanDistinctReducer) AggregateBoolean added in v0.13.0

func (r *BooleanDistinctReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean aggregates a point into the reducer.

func (*BooleanDistinctReducer) Emit added in v0.13.0

Emit emits the distinct points that have been aggregated into the reducer.

type BooleanElapsedReducer added in v0.13.0

type BooleanElapsedReducer struct {
	// contains filtered or unexported fields
}

BooleanElapsedReducer calculates the elapsed of the aggregated points.

func NewBooleanElapsedReducer added in v0.13.0

func NewBooleanElapsedReducer(interval Interval) *BooleanElapsedReducer

NewBooleanElapsedReducer creates a new BooleanElapsedReducer.

func (*BooleanElapsedReducer) AggregateBoolean added in v0.13.0

func (r *BooleanElapsedReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean aggregates a point into the reducer and updates the current window.

func (*BooleanElapsedReducer) Emit added in v0.13.0

func (r *BooleanElapsedReducer) Emit() []IntegerPoint

Emit emits the elapsed of the reducer at the current point.

type BooleanFuncFloatReducer added in v0.11.0

type BooleanFuncFloatReducer struct {
	// contains filtered or unexported fields
}

BooleanFuncFloatReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewBooleanFuncFloatReducer added in v0.11.0

func NewBooleanFuncFloatReducer(fn BooleanReduceFloatFunc, prev *FloatPoint) *BooleanFuncFloatReducer

NewBooleanFuncFloatReducer creates a new BooleanFuncFloatReducer.

func (*BooleanFuncFloatReducer) AggregateBoolean added in v0.11.0

func (r *BooleanFuncFloatReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean takes a BooleanPoint and invokes the reduce function with the current and new point to modify the current point.

func (*BooleanFuncFloatReducer) Emit added in v0.11.0

func (r *BooleanFuncFloatReducer) Emit() []FloatPoint

Emit emits the point that was generated when reducing the points fed in with AggregateBoolean.

type BooleanFuncIntegerReducer added in v0.11.0

type BooleanFuncIntegerReducer struct {
	// contains filtered or unexported fields
}

BooleanFuncIntegerReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewBooleanFuncIntegerReducer added in v0.11.0

func NewBooleanFuncIntegerReducer(fn BooleanReduceIntegerFunc, prev *IntegerPoint) *BooleanFuncIntegerReducer

NewBooleanFuncIntegerReducer creates a new BooleanFuncIntegerReducer.

func (*BooleanFuncIntegerReducer) AggregateBoolean added in v0.11.0

func (r *BooleanFuncIntegerReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean takes a BooleanPoint and invokes the reduce function with the current and new point to modify the current point.

func (*BooleanFuncIntegerReducer) Emit added in v0.11.0

Emit emits the point that was generated when reducing the points fed in with AggregateBoolean.

type BooleanFuncReducer added in v0.11.0

type BooleanFuncReducer struct {
	// contains filtered or unexported fields
}

BooleanFuncReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewBooleanFuncReducer added in v0.11.0

func NewBooleanFuncReducer(fn BooleanReduceFunc, prev *BooleanPoint) *BooleanFuncReducer

NewBooleanFuncReducer creates a new BooleanFuncBooleanReducer.

func (*BooleanFuncReducer) AggregateBoolean added in v0.11.0

func (r *BooleanFuncReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean takes a BooleanPoint and invokes the reduce function with the current and new point to modify the current point.

func (*BooleanFuncReducer) Emit added in v0.11.0

func (r *BooleanFuncReducer) Emit() []BooleanPoint

Emit emits the point that was generated when reducing the points fed in with AggregateBoolean.

type BooleanFuncStringReducer added in v0.11.0

type BooleanFuncStringReducer struct {
	// contains filtered or unexported fields
}

BooleanFuncStringReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewBooleanFuncStringReducer added in v0.11.0

func NewBooleanFuncStringReducer(fn BooleanReduceStringFunc, prev *StringPoint) *BooleanFuncStringReducer

NewBooleanFuncStringReducer creates a new BooleanFuncStringReducer.

func (*BooleanFuncStringReducer) AggregateBoolean added in v0.11.0

func (r *BooleanFuncStringReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean takes a BooleanPoint and invokes the reduce function with the current and new point to modify the current point.

func (*BooleanFuncStringReducer) Emit added in v0.11.0

Emit emits the point that was generated when reducing the points fed in with AggregateBoolean.

type BooleanIterator added in v0.11.0

type BooleanIterator interface {
	Iterator
	Next() (*BooleanPoint, error)
}

BooleanIterator represents a stream of boolean points.

type BooleanLiteral

type BooleanLiteral struct {
	Val bool
}

BooleanLiteral represents a boolean literal.

func (*BooleanLiteral) String

func (l *BooleanLiteral) String() string

String returns a string representation of the literal.

type BooleanPoint added in v0.11.0

type BooleanPoint struct {
	Name string
	Tags Tags

	Time  int64
	Nil   bool
	Value bool
	Aux   []interface{}

	// Total number of points that were combined into this point from an aggregate.
	// If this is zero, the point is not the result of an aggregate function.
	Aggregated uint32
}

BooleanPoint represents a point with a bool value. DO NOT ADD ADDITIONAL FIELDS TO THIS STRUCT. See TestPoint_Fields in influxql/point_test.go for more details.

func BooleanModeReduceSlice added in v1.0.0

func BooleanModeReduceSlice(a []BooleanPoint) []BooleanPoint

BooleanModeReduceSlice returns the mode value within a window.

func (*BooleanPoint) Clone added in v0.11.0

func (v *BooleanPoint) Clone() *BooleanPoint

Clone returns a copy of v.

func (*BooleanPoint) CopyTo added in v1.2.0

func (v *BooleanPoint) CopyTo(other *BooleanPoint)

CopyTo makes a deep copy into the point.

type BooleanPointAggregator added in v0.11.0

type BooleanPointAggregator interface {
	AggregateBoolean(p *BooleanPoint)
}

BooleanPointAggregator aggregates points to produce a single point.

type BooleanPointDecoder added in v0.11.0

type BooleanPointDecoder struct {
	// contains filtered or unexported fields
}

BooleanPointDecoder decodes BooleanPoint points from a reader.

func NewBooleanPointDecoder added in v0.11.0

func NewBooleanPointDecoder(r io.Reader) *BooleanPointDecoder

NewBooleanPointDecoder returns a new instance of BooleanPointDecoder that reads from r.

func (*BooleanPointDecoder) DecodeBooleanPoint added in v0.11.0

func (dec *BooleanPointDecoder) DecodeBooleanPoint(p *BooleanPoint) error

DecodeBooleanPoint reads from the underlying reader and unmarshals into p.

func (*BooleanPointDecoder) Stats added in v0.12.0

func (dec *BooleanPointDecoder) Stats() IteratorStats

Stats returns iterator stats embedded within the stream.

type BooleanPointEmitter added in v0.11.0

type BooleanPointEmitter interface {
	Emit() []BooleanPoint
}

BooleanPointEmitter produces a single point from an aggregate.

type BooleanPointEncoder added in v0.11.0

type BooleanPointEncoder struct {
	// contains filtered or unexported fields
}

BooleanPointEncoder encodes BooleanPoint points to a writer.

func NewBooleanPointEncoder added in v0.11.0

func NewBooleanPointEncoder(w io.Writer) *BooleanPointEncoder

NewBooleanPointEncoder returns a new instance of BooleanPointEncoder that writes to w.

func (*BooleanPointEncoder) EncodeBooleanPoint added in v0.11.0

func (enc *BooleanPointEncoder) EncodeBooleanPoint(p *BooleanPoint) error

EncodeBooleanPoint marshals and writes p to the underlying writer.

type BooleanReduceFloatFunc added in v0.11.0

type BooleanReduceFloatFunc func(prev *FloatPoint, curr *BooleanPoint) (t int64, v float64, aux []interface{})

BooleanReduceFloatFunc is the function called by a BooleanPoint reducer.

type BooleanReduceFloatSliceFunc added in v0.11.0

type BooleanReduceFloatSliceFunc func(a []BooleanPoint) []FloatPoint

BooleanReduceFloatSliceFunc is the function called by a BooleanPoint reducer.

type BooleanReduceFunc added in v0.11.0

type BooleanReduceFunc func(prev *BooleanPoint, curr *BooleanPoint) (t int64, v bool, aux []interface{})

BooleanReduceFunc is the function called by a BooleanPoint reducer.

type BooleanReduceIntegerFunc added in v0.11.0

type BooleanReduceIntegerFunc func(prev *IntegerPoint, curr *BooleanPoint) (t int64, v int64, aux []interface{})

BooleanReduceIntegerFunc is the function called by a BooleanPoint reducer.

type BooleanReduceIntegerSliceFunc added in v0.11.0

type BooleanReduceIntegerSliceFunc func(a []BooleanPoint) []IntegerPoint

BooleanReduceIntegerSliceFunc is the function called by a BooleanPoint reducer.

type BooleanReduceSliceFunc added in v0.11.0

type BooleanReduceSliceFunc func(a []BooleanPoint) []BooleanPoint

BooleanReduceSliceFunc is the function called by a BooleanPoint reducer.

type BooleanReduceStringFunc added in v0.11.0

type BooleanReduceStringFunc func(prev *StringPoint, curr *BooleanPoint) (t int64, v string, aux []interface{})

BooleanReduceStringFunc is the function called by a BooleanPoint reducer.

type BooleanReduceStringSliceFunc added in v0.11.0

type BooleanReduceStringSliceFunc func(a []BooleanPoint) []StringPoint

BooleanReduceStringSliceFunc is the function called by a BooleanPoint reducer.

type BooleanSampleReducer added in v1.1.0

type BooleanSampleReducer struct {
	// contains filtered or unexported fields
}

BooleanSampleReducer implements a reservoir sampling to calculate a random subset of points

func NewBooleanSampleReducer added in v1.1.0

func NewBooleanSampleReducer(size int) *BooleanSampleReducer

NewBooleanSampleReducer creates a new BooleanSampleReducer

func (*BooleanSampleReducer) AggregateBoolean added in v1.1.0

func (r *BooleanSampleReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean aggregates a point into the reducer.

func (*BooleanSampleReducer) Emit added in v1.1.0

func (r *BooleanSampleReducer) Emit() []BooleanPoint

Emit emits the reservoir sample as many points.

type BooleanSliceFuncFloatReducer added in v0.11.0

type BooleanSliceFuncFloatReducer struct {
	// contains filtered or unexported fields
}

BooleanSliceFuncFloatReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewBooleanSliceFuncFloatReducer added in v0.11.0

func NewBooleanSliceFuncFloatReducer(fn BooleanReduceFloatSliceFunc) *BooleanSliceFuncFloatReducer

NewBooleanSliceFuncFloatReducer creates a new BooleanSliceFuncFloatReducer.

func (*BooleanSliceFuncFloatReducer) AggregateBoolean added in v0.11.0

func (r *BooleanSliceFuncFloatReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean copies the BooleanPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*BooleanSliceFuncFloatReducer) AggregateBooleanBulk added in v0.11.0

func (r *BooleanSliceFuncFloatReducer) AggregateBooleanBulk(points []BooleanPoint)

AggregateBooleanBulk performs a bulk copy of BooleanPoints into the internal slice. This is a more efficient version of calling AggregateBoolean on each point.

func (*BooleanSliceFuncFloatReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type BooleanSliceFuncIntegerReducer added in v0.11.0

type BooleanSliceFuncIntegerReducer struct {
	// contains filtered or unexported fields
}

BooleanSliceFuncIntegerReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewBooleanSliceFuncIntegerReducer added in v0.11.0

func NewBooleanSliceFuncIntegerReducer(fn BooleanReduceIntegerSliceFunc) *BooleanSliceFuncIntegerReducer

NewBooleanSliceFuncIntegerReducer creates a new BooleanSliceFuncIntegerReducer.

func (*BooleanSliceFuncIntegerReducer) AggregateBoolean added in v0.11.0

func (r *BooleanSliceFuncIntegerReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean copies the BooleanPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*BooleanSliceFuncIntegerReducer) AggregateBooleanBulk added in v0.11.0

func (r *BooleanSliceFuncIntegerReducer) AggregateBooleanBulk(points []BooleanPoint)

AggregateBooleanBulk performs a bulk copy of BooleanPoints into the internal slice. This is a more efficient version of calling AggregateBoolean on each point.

func (*BooleanSliceFuncIntegerReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type BooleanSliceFuncReducer added in v0.11.0

type BooleanSliceFuncReducer struct {
	// contains filtered or unexported fields
}

BooleanSliceFuncReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewBooleanSliceFuncReducer added in v0.11.0

func NewBooleanSliceFuncReducer(fn BooleanReduceSliceFunc) *BooleanSliceFuncReducer

NewBooleanSliceFuncReducer creates a new BooleanSliceFuncReducer.

func (*BooleanSliceFuncReducer) AggregateBoolean added in v0.11.0

func (r *BooleanSliceFuncReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean copies the BooleanPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*BooleanSliceFuncReducer) AggregateBooleanBulk added in v0.11.0

func (r *BooleanSliceFuncReducer) AggregateBooleanBulk(points []BooleanPoint)

AggregateBooleanBulk performs a bulk copy of BooleanPoints into the internal slice. This is a more efficient version of calling AggregateBoolean on each point.

func (*BooleanSliceFuncReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type BooleanSliceFuncStringReducer added in v0.11.0

type BooleanSliceFuncStringReducer struct {
	// contains filtered or unexported fields
}

BooleanSliceFuncStringReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewBooleanSliceFuncStringReducer added in v0.11.0

func NewBooleanSliceFuncStringReducer(fn BooleanReduceStringSliceFunc) *BooleanSliceFuncStringReducer

NewBooleanSliceFuncStringReducer creates a new BooleanSliceFuncStringReducer.

func (*BooleanSliceFuncStringReducer) AggregateBoolean added in v0.11.0

func (r *BooleanSliceFuncStringReducer) AggregateBoolean(p *BooleanPoint)

AggregateBoolean copies the BooleanPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*BooleanSliceFuncStringReducer) AggregateBooleanBulk added in v0.11.0

func (r *BooleanSliceFuncStringReducer) AggregateBooleanBulk(points []BooleanPoint)

AggregateBooleanBulk performs a bulk copy of BooleanPoints into the internal slice. This is a more efficient version of calling AggregateBoolean on each point.

func (*BooleanSliceFuncStringReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type Call

type Call struct {
	Name string
	Args []Expr
}

Call represents a function call.

func (*Call) String

func (c *Call) String() string

String returns a string representation of the call.

type CreateContinuousQueryStatement

type CreateContinuousQueryStatement struct {
	// Name of the continuous query to be created.
	Name string

	// Name of the database to create the continuous query on.
	Database string

	// Source of data (SELECT statement).
	Source *SelectStatement

	// Interval to resample previous queries.
	ResampleEvery time.Duration

	// Maximum duration to resample previous queries.
	ResampleFor time.Duration
}

CreateContinuousQueryStatement represents a command for creating a continuous query.

func (*CreateContinuousQueryStatement) DefaultDatabase

func (s *CreateContinuousQueryStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*CreateContinuousQueryStatement) RequiredPrivileges

func (s *CreateContinuousQueryStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a CreateContinuousQueryStatement.

func (*CreateContinuousQueryStatement) String

String returns a string representation of the statement.

type CreateDatabaseStatement

type CreateDatabaseStatement struct {
	// Name of the database to be created.
	Name string

	// RetentionPolicyCreate indicates whether the user explicitly wants to create a retention policy.
	RetentionPolicyCreate bool

	// RetentionPolicyDuration indicates retention duration for the new database.
	RetentionPolicyDuration *time.Duration

	// RetentionPolicyReplication indicates retention replication for the new database.
	RetentionPolicyReplication *int

	// RetentionPolicyName indicates retention name for the new database.
	RetentionPolicyName string

	// RetentionPolicyShardGroupDuration indicates shard group duration for the new database.
	RetentionPolicyShardGroupDuration time.Duration
}

CreateDatabaseStatement represents a command for creating a new database.

func (*CreateDatabaseStatement) RequiredPrivileges

func (s *CreateDatabaseStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a CreateDatabaseStatement.

func (*CreateDatabaseStatement) String

func (s *CreateDatabaseStatement) String() string

String returns a string representation of the create database statement.

type CreateRetentionPolicyStatement

type CreateRetentionPolicyStatement struct {
	// Name of policy to create.
	Name string

	// Name of database this policy belongs to.
	Database string

	// Duration data written to this policy will be retained.
	Duration time.Duration

	// Replication factor for data written to this policy.
	Replication int

	// Should this policy be set as default for the database?
	Default bool

	// Shard Duration.
	ShardGroupDuration time.Duration
}

CreateRetentionPolicyStatement represents a command to create a retention policy.

func (*CreateRetentionPolicyStatement) DefaultDatabase added in v1.1.5

func (s *CreateRetentionPolicyStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*CreateRetentionPolicyStatement) RequiredPrivileges

func (s *CreateRetentionPolicyStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a CreateRetentionPolicyStatement.

func (*CreateRetentionPolicyStatement) String

String returns a string representation of the create retention policy.

type CreateSubscriptionStatement added in v0.9.5

type CreateSubscriptionStatement struct {
	Name            string
	Database        string
	RetentionPolicy string
	Destinations    []string
	Mode            string
}

CreateSubscriptionStatement represents a command to add a subscription to the incoming data stream.

func (*CreateSubscriptionStatement) DefaultDatabase added in v1.1.5

func (s *CreateSubscriptionStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*CreateSubscriptionStatement) RequiredPrivileges added in v0.9.5

func (s *CreateSubscriptionStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a CreateSubscriptionStatement.

func (*CreateSubscriptionStatement) String added in v0.9.5

func (s *CreateSubscriptionStatement) String() string

String returns a string representation of the CreateSubscriptionStatement.

type CreateUserStatement

type CreateUserStatement struct {
	// Name of the user to be created.
	Name string

	// User's password.
	Password string

	// User's admin privilege.
	Admin bool
}

CreateUserStatement represents a command for creating a new user.

func (*CreateUserStatement) RequiredPrivileges

func (s *CreateUserStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege(s) required to execute a CreateUserStatement.

func (*CreateUserStatement) String

func (s *CreateUserStatement) String() string

String returns a string representation of the create user statement.

type DataType

type DataType int

DataType represents the primitive data types available in InfluxQL.

func EvalType added in v1.2.0

func EvalType(expr Expr, sources Sources, typmap TypeMapper) DataType

EvalType evaluates the expression's type.

func InspectDataType

func InspectDataType(v interface{}) DataType

InspectDataType returns the data type of a given value.

func InspectDataTypes added in v0.11.0

func InspectDataTypes(a []interface{}) []DataType

InspectDataTypes returns all of the data types for an interface slice.

func (DataType) LessThan added in v1.2.1

func (d DataType) LessThan(other DataType) bool

LessThan returns true if the other DataType has greater precedence than the current data type. Unknown has the lowest precedence.

NOTE: This is not the same as using the `<` or `>` operator because the integers used decrease with higher precedence, but Unknown is the lowest precedence at the zero value.

func (DataType) String added in v0.9.1

func (d DataType) String() string

String returns the human-readable string representation of the DataType.

type DeleteSeriesStatement added in v0.13.0

type DeleteSeriesStatement struct {
	// Data source that fields are extracted from (optional)
	Sources Sources

	// An expression evaluated on data point (optional)
	Condition Expr
}

DeleteSeriesStatement represents a command for deleting all or part of a series from a database.

func (DeleteSeriesStatement) RequiredPrivileges added in v0.13.0

func (s DeleteSeriesStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a DeleteSeriesStatement.

func (*DeleteSeriesStatement) String added in v0.13.0

func (s *DeleteSeriesStatement) String() string

String returns a string representation of the delete series statement.

type DeleteStatement

type DeleteStatement struct {
	// Data source that values are removed from.
	Source Source

	// An expression evaluated on data point.
	Condition Expr
}

DeleteStatement represents a command for deleting data from the database.

func (*DeleteStatement) DefaultDatabase added in v1.1.5

func (s *DeleteStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*DeleteStatement) RequiredPrivileges

func (s *DeleteStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a DeleteStatement.

func (*DeleteStatement) String

func (s *DeleteStatement) String() string

String returns a string representation of the delete statement.

type Dimension

type Dimension struct {
	Expr Expr
}

Dimension represents an expression that a select statement is grouped by.

func (*Dimension) String

func (d *Dimension) String() string

String returns a string representation of the dimension.

type Dimensions

type Dimensions []*Dimension

Dimensions represents a list of dimensions.

func (Dimensions) Normalize

func (a Dimensions) Normalize() (time.Duration, []string)

Normalize returns the interval and tag dimensions separately. Returns 0 if no time interval is specified.

func (Dimensions) String

func (a Dimensions) String() string

String returns a string representation of the dimensions.

type Distinct

type Distinct struct {
	// Identifier following DISTINCT
	Val string
}

Distinct represents a DISTINCT expression.

func (*Distinct) NewCall

func (d *Distinct) NewCall() *Call

NewCall returns a new call expression from this expressions.

func (*Distinct) String

func (d *Distinct) String() string

String returns a string representation of the expression.

type DropContinuousQueryStatement

type DropContinuousQueryStatement struct {
	Name     string
	Database string
}

DropContinuousQueryStatement represents a command for removing a continuous query.

func (*DropContinuousQueryStatement) DefaultDatabase added in v1.1.5

func (s *DropContinuousQueryStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*DropContinuousQueryStatement) RequiredPrivileges

func (s *DropContinuousQueryStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege(s) required to execute a DropContinuousQueryStatement

func (*DropContinuousQueryStatement) String

String returns a string representation of the statement.

type DropDatabaseStatement

type DropDatabaseStatement struct {
	// Name of the database to be dropped.
	Name string
}

DropDatabaseStatement represents a command to drop a database.

func (*DropDatabaseStatement) RequiredPrivileges

func (s *DropDatabaseStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a DropDatabaseStatement.

func (*DropDatabaseStatement) String

func (s *DropDatabaseStatement) String() string

String returns a string representation of the drop database statement.

type DropMeasurementStatement

type DropMeasurementStatement struct {
	// Name of the measurement to be dropped.
	Name string
}

DropMeasurementStatement represents a command to drop a measurement.

func (*DropMeasurementStatement) RequiredPrivileges

func (s *DropMeasurementStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege(s) required to execute a DropMeasurementStatement

func (*DropMeasurementStatement) String

func (s *DropMeasurementStatement) String() string

String returns a string representation of the drop measurement statement.

type DropRetentionPolicyStatement

type DropRetentionPolicyStatement struct {
	// Name of the policy to drop.
	Name string

	// Name of the database to drop the policy from.
	Database string
}

DropRetentionPolicyStatement represents a command to drop a retention policy from a database.

func (*DropRetentionPolicyStatement) DefaultDatabase added in v1.1.5

func (s *DropRetentionPolicyStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*DropRetentionPolicyStatement) RequiredPrivileges

func (s *DropRetentionPolicyStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a DropRetentionPolicyStatement.

func (*DropRetentionPolicyStatement) String

String returns a string representation of the drop retention policy statement.

type DropSeriesStatement

type DropSeriesStatement struct {
	// Data source that fields are extracted from (optional)
	Sources Sources

	// An expression evaluated on data point (optional)
	Condition Expr
}

DropSeriesStatement represents a command for removing a series from the database.

func (DropSeriesStatement) RequiredPrivileges

func (s DropSeriesStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a DropSeriesStatement.

func (*DropSeriesStatement) String

func (s *DropSeriesStatement) String() string

String returns a string representation of the drop series statement.

type DropShardStatement added in v0.12.0

type DropShardStatement struct {
	// ID of the shard to be dropped.
	ID uint64
}

DropShardStatement represents a command for removing a shard from the node.

func (*DropShardStatement) RequiredPrivileges added in v0.12.0

func (s *DropShardStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a DropShardStatement.

func (*DropShardStatement) String added in v0.12.0

func (s *DropShardStatement) String() string

String returns a string representation of the drop series statement.

type DropSubscriptionStatement added in v0.9.5

type DropSubscriptionStatement struct {
	Name            string
	Database        string
	RetentionPolicy string
}

DropSubscriptionStatement represents a command to drop a subscription to the incoming data stream.

func (*DropSubscriptionStatement) DefaultDatabase added in v1.1.5

func (s *DropSubscriptionStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*DropSubscriptionStatement) RequiredPrivileges added in v0.9.5

func (s *DropSubscriptionStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a DropSubscriptionStatement

func (*DropSubscriptionStatement) String added in v0.9.5

func (s *DropSubscriptionStatement) String() string

String returns a string representation of the DropSubscriptionStatement.

type DropUserStatement

type DropUserStatement struct {
	// Name of the user to drop.
	Name string
}

DropUserStatement represents a command for dropping a user.

func (*DropUserStatement) RequiredPrivileges

func (s *DropUserStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege(s) required to execute a DropUserStatement.

func (*DropUserStatement) String

func (s *DropUserStatement) String() string

String returns a string representation of the drop user statement.

type DurationLiteral

type DurationLiteral struct {
	Val time.Duration
}

DurationLiteral represents a duration literal.

func (*DurationLiteral) String

func (l *DurationLiteral) String() string

String returns a string representation of the literal.

type Emitter added in v0.11.0

type Emitter struct {

	// The columns to attach to each row.
	Columns []string

	// The time zone location.
	Location *time.Location

	// Removes the "time" column from output.
	// Used for meta queries where time does not apply.
	OmitTime bool
	// contains filtered or unexported fields
}

Emitter groups values together by name, tags, and time.

func NewEmitter added in v0.11.0

func NewEmitter(itrs []Iterator, ascending bool, chunkSize int) *Emitter

NewEmitter returns a new instance of Emitter that pulls from itrs.

func (*Emitter) Close added in v0.11.0

func (e *Emitter) Close() error

Close closes the underlying iterators.

func (*Emitter) Emit added in v0.11.0

func (e *Emitter) Emit() (*models.Row, bool, error)

Emit returns the next row from the iterators.

type ExecutionContext added in v0.13.0

type ExecutionContext struct {
	// The statement ID of the executing query.
	StatementID int

	// The query ID of the executing query.
	QueryID uint64

	// The query task information available to the StatementExecutor.
	Query *QueryTask

	// Output channel where results and errors should be sent.
	Results chan *Result

	// Hold the query executor's logger.
	Log zap.Logger

	// A channel that is closed when the query is interrupted.
	InterruptCh <-chan struct{}

	// Options used to start this query.
	ExecutionOptions
}

ExecutionContext contains state that the query is currently executing with.

func (*ExecutionContext) Send added in v1.1.0

func (ctx *ExecutionContext) Send(result *Result) error

Send sends a Result to the Results channel and will exit if the query has been interrupted or aborted.

type ExecutionOptions added in v1.0.0

type ExecutionOptions struct {
	// The database the query is running against.
	Database string

	// How to determine whether the query is allowed to execute,
	// what resources can be returned in SHOW queries, etc.
	Authorizer Authorizer

	// The requested maximum number of points to return in each result.
	ChunkSize int

	// If this query is being executed in a read-only context.
	ReadOnly bool

	// Node to execute on.
	NodeID uint64

	// Quiet suppresses non-essential output from the query executor.
	Quiet bool

	// AbortCh is a channel that signals when results are no longer desired by the caller.
	AbortCh <-chan struct{}
}

ExecutionOptions contains the options for executing a query.

type ExecutionPrivilege

type ExecutionPrivilege struct {
	// Admin privilege required.
	Admin bool

	// Name of the database.
	Name string

	// Database privilege required.
	Privilege Privilege
}

ExecutionPrivilege is a privilege required for a user to execute a statement on a database or resource.

type ExecutionPrivileges

type ExecutionPrivileges []ExecutionPrivilege

ExecutionPrivileges is a list of privileges required to execute a statement.

type Expr

type Expr interface {
	Node
	// contains filtered or unexported methods
}

Expr represents an expression that can be evaluated to a value.

func CloneExpr

func CloneExpr(expr Expr) Expr

CloneExpr returns a deep copy of the expression.

func MustParseExpr added in v0.11.0

func MustParseExpr(s string) Expr

MustParseExpr parses an expression string and returns its AST. Panic on error.

func ParseExpr

func ParseExpr(s string) (Expr, error)

ParseExpr parses an expression string and returns its AST representation.

func Reduce

func Reduce(expr Expr, valuer Valuer) Expr

Reduce evaluates expr using the available values in valuer. References that don't exist in valuer are ignored.

func RewriteExpr added in v0.11.0

func RewriteExpr(expr Expr, fn func(Expr) Expr) Expr

RewriteExpr recursively invokes the function to replace each expr. Nodes are traversed depth-first and rewritten from leaf to root.

type Field

type Field struct {
	Expr  Expr
	Alias string
}

Field represents an expression retrieved from a select statement.

func (*Field) Name

func (f *Field) Name() string

Name returns the name of the field. Returns alias, if set. Otherwise uses the function name or variable name.

func (*Field) String

func (f *Field) String() string

String returns a string representation of the field.

type FieldMap added in v1.2.1

type FieldMap int

func (FieldMap) Value added in v1.2.1

func (i FieldMap) Value(tags Tags, buf []interface{}) interface{}

type FieldMapper added in v1.2.0

type FieldMapper interface {
	FieldDimensions(m *Measurement) (fields map[string]DataType, dimensions map[string]struct{}, err error)

	TypeMapper
}

FieldMapper returns the data type for the field inside of the measurement.

type Fields

type Fields []*Field

Fields represents a list of fields.

func (Fields) AliasNames added in v0.9.3

func (a Fields) AliasNames() []string

AliasNames returns a list of calculated field names in order of alias, function name, then field.

func (Fields) Len

func (a Fields) Len() int

Len implements sort.Interface.

func (Fields) Less

func (a Fields) Less(i, j int) bool

Less implements sort.Interface.

func (Fields) Names added in v0.9.3

func (a Fields) Names() []string

Names returns a list of field names.

func (Fields) String

func (a Fields) String() string

String returns a string representation of the fields.

func (Fields) Swap

func (a Fields) Swap(i, j int)

Swap implements sort.Interface.

type FillOption

type FillOption int

FillOption represents different options for filling aggregate windows.

const (
	// NullFill means that empty aggregate windows will just have null values.
	NullFill FillOption = iota
	// NoFill means that empty aggregate windows will be purged from the result.
	NoFill
	// NumberFill means that empty aggregate windows will be filled with a provided number.
	NumberFill
	// PreviousFill means that empty aggregate windows will be filled with whatever the previous aggregate window had.
	PreviousFill
	// LinearFill means that empty aggregate windows will be filled with whatever a linear value between non null windows.
	LinearFill
)

type FloatBottomReducer added in v1.3.0

type FloatBottomReducer struct {
	// contains filtered or unexported fields
}

func NewFloatBottomReducer added in v1.3.0

func NewFloatBottomReducer(n int) *FloatBottomReducer

func (*FloatBottomReducer) AggregateFloat added in v1.3.0

func (r *FloatBottomReducer) AggregateFloat(p *FloatPoint)

func (*FloatBottomReducer) Emit added in v1.3.0

func (r *FloatBottomReducer) Emit() []FloatPoint

type FloatBulkPointAggregator added in v0.11.0

type FloatBulkPointAggregator interface {
	AggregateFloatBulk(points []FloatPoint)
}

FloatBulkPointAggregator aggregates multiple points at a time.

type FloatCumulativeSumReducer added in v1.1.0

type FloatCumulativeSumReducer struct {
	// contains filtered or unexported fields
}

FloatCumulativeSumReducer cumulates the values from each point.

func NewFloatCumulativeSumReducer added in v1.1.0

func NewFloatCumulativeSumReducer() *FloatCumulativeSumReducer

NewFloatCumulativeSumReducer creates a new FloatCumulativeSumReducer.

func (*FloatCumulativeSumReducer) AggregateFloat added in v1.1.0

func (r *FloatCumulativeSumReducer) AggregateFloat(p *FloatPoint)

func (*FloatCumulativeSumReducer) Emit added in v1.1.0

type FloatDerivativeReducer added in v0.13.0

type FloatDerivativeReducer struct {
	// contains filtered or unexported fields
}

FloatDerivativeReducer calculates the derivative of the aggregated points.

func NewFloatDerivativeReducer added in v0.13.0

func NewFloatDerivativeReducer(interval Interval, isNonNegative, ascending bool) *FloatDerivativeReducer

NewFloatDerivativeReducer creates a new FloatDerivativeReducer.

func (*FloatDerivativeReducer) AggregateFloat added in v0.13.0

func (r *FloatDerivativeReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer and updates the current window.

func (*FloatDerivativeReducer) Emit added in v0.13.0

func (r *FloatDerivativeReducer) Emit() []FloatPoint

Emit emits the derivative of the reducer at the current point.

type FloatDifferenceReducer added in v0.13.0

type FloatDifferenceReducer struct {
	// contains filtered or unexported fields
}

FloatDifferenceReducer calculates the derivative of the aggregated points.

func NewFloatDifferenceReducer added in v0.13.0

func NewFloatDifferenceReducer(isNonNegative bool) *FloatDifferenceReducer

NewFloatDifferenceReducer creates a new FloatDifferenceReducer.

func (*FloatDifferenceReducer) AggregateFloat added in v0.13.0

func (r *FloatDifferenceReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer and updates the current window.

func (*FloatDifferenceReducer) Emit added in v0.13.0

func (r *FloatDifferenceReducer) Emit() []FloatPoint

Emit emits the difference of the reducer at the current point.

type FloatDistinctReducer added in v0.13.0

type FloatDistinctReducer struct {
	// contains filtered or unexported fields
}

FloatDistinctReducer returns the distinct points in a series.

func NewFloatDistinctReducer added in v0.13.0

func NewFloatDistinctReducer() *FloatDistinctReducer

NewFloatDistinctReducer creates a new FloatDistinctReducer.

func (*FloatDistinctReducer) AggregateFloat added in v0.13.0

func (r *FloatDistinctReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer.

func (*FloatDistinctReducer) Emit added in v0.13.0

func (r *FloatDistinctReducer) Emit() []FloatPoint

Emit emits the distinct points that have been aggregated into the reducer.

type FloatElapsedReducer added in v0.13.0

type FloatElapsedReducer struct {
	// contains filtered or unexported fields
}

FloatElapsedReducer calculates the elapsed of the aggregated points.

func NewFloatElapsedReducer added in v0.13.0

func NewFloatElapsedReducer(interval Interval) *FloatElapsedReducer

NewFloatElapsedReducer creates a new FloatElapsedReducer.

func (*FloatElapsedReducer) AggregateFloat added in v0.13.0

func (r *FloatElapsedReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer and updates the current window.

func (*FloatElapsedReducer) Emit added in v0.13.0

func (r *FloatElapsedReducer) Emit() []IntegerPoint

Emit emits the elapsed of the reducer at the current point.

type FloatFuncBooleanReducer added in v0.11.0

type FloatFuncBooleanReducer struct {
	// contains filtered or unexported fields
}

FloatFuncBooleanReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewFloatFuncBooleanReducer added in v0.11.0

func NewFloatFuncBooleanReducer(fn FloatReduceBooleanFunc, prev *BooleanPoint) *FloatFuncBooleanReducer

NewFloatFuncBooleanReducer creates a new FloatFuncBooleanReducer.

func (*FloatFuncBooleanReducer) AggregateFloat added in v0.11.0

func (r *FloatFuncBooleanReducer) AggregateFloat(p *FloatPoint)

AggregateFloat takes a FloatPoint and invokes the reduce function with the current and new point to modify the current point.

func (*FloatFuncBooleanReducer) Emit added in v0.11.0

Emit emits the point that was generated when reducing the points fed in with AggregateFloat.

type FloatFuncIntegerReducer added in v0.11.0

type FloatFuncIntegerReducer struct {
	// contains filtered or unexported fields
}

FloatFuncIntegerReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewFloatFuncIntegerReducer added in v0.11.0

func NewFloatFuncIntegerReducer(fn FloatReduceIntegerFunc, prev *IntegerPoint) *FloatFuncIntegerReducer

NewFloatFuncIntegerReducer creates a new FloatFuncIntegerReducer.

func (*FloatFuncIntegerReducer) AggregateFloat added in v0.11.0

func (r *FloatFuncIntegerReducer) AggregateFloat(p *FloatPoint)

AggregateFloat takes a FloatPoint and invokes the reduce function with the current and new point to modify the current point.

func (*FloatFuncIntegerReducer) Emit added in v0.11.0

Emit emits the point that was generated when reducing the points fed in with AggregateFloat.

type FloatFuncReducer added in v0.11.0

type FloatFuncReducer struct {
	// contains filtered or unexported fields
}

FloatFuncReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewFloatFuncReducer added in v0.11.0

func NewFloatFuncReducer(fn FloatReduceFunc, prev *FloatPoint) *FloatFuncReducer

NewFloatFuncReducer creates a new FloatFuncFloatReducer.

func (*FloatFuncReducer) AggregateFloat added in v0.11.0

func (r *FloatFuncReducer) AggregateFloat(p *FloatPoint)

AggregateFloat takes a FloatPoint and invokes the reduce function with the current and new point to modify the current point.

func (*FloatFuncReducer) Emit added in v0.11.0

func (r *FloatFuncReducer) Emit() []FloatPoint

Emit emits the point that was generated when reducing the points fed in with AggregateFloat.

type FloatFuncStringReducer added in v0.11.0

type FloatFuncStringReducer struct {
	// contains filtered or unexported fields
}

FloatFuncStringReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewFloatFuncStringReducer added in v0.11.0

func NewFloatFuncStringReducer(fn FloatReduceStringFunc, prev *StringPoint) *FloatFuncStringReducer

NewFloatFuncStringReducer creates a new FloatFuncStringReducer.

func (*FloatFuncStringReducer) AggregateFloat added in v0.11.0

func (r *FloatFuncStringReducer) AggregateFloat(p *FloatPoint)

AggregateFloat takes a FloatPoint and invokes the reduce function with the current and new point to modify the current point.

func (*FloatFuncStringReducer) Emit added in v0.11.0

func (r *FloatFuncStringReducer) Emit() []StringPoint

Emit emits the point that was generated when reducing the points fed in with AggregateFloat.

type FloatHoltWintersReducer added in v1.0.0

type FloatHoltWintersReducer struct {
	// contains filtered or unexported fields
}

FloatHoltWintersReducer forecasts a series into the future. This is done using the Holt-Winters damped method.

1. Using the series the initial values are calculated using a SSE.
2. The series is forecasted into the future using the iterative relations.

func NewFloatHoltWintersReducer added in v1.0.0

func NewFloatHoltWintersReducer(h, m int, includeFitData bool, interval time.Duration) *FloatHoltWintersReducer

NewFloatHoltWintersReducer creates a new FloatHoltWintersReducer.

func (*FloatHoltWintersReducer) AggregateFloat added in v1.0.0

func (r *FloatHoltWintersReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer and updates the current window.

func (*FloatHoltWintersReducer) AggregateInteger added in v1.0.0

func (r *FloatHoltWintersReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer and updates the current window.

func (*FloatHoltWintersReducer) Emit added in v1.0.0

func (r *FloatHoltWintersReducer) Emit() []FloatPoint

Emit returns the points generated by the HoltWinters algorithm.

type FloatIntegralReducer added in v1.3.0

type FloatIntegralReducer struct {
	// contains filtered or unexported fields
}

FloatIntegralReducer calculates the time-integral of the aggregated points.

func NewFloatIntegralReducer added in v1.3.0

func NewFloatIntegralReducer(interval Interval, opt IteratorOptions) *FloatIntegralReducer

NewFloatIntegralReducer creates a new FloatIntegralReducer.

func (*FloatIntegralReducer) AggregateFloat added in v1.3.0

func (r *FloatIntegralReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer.

func (*FloatIntegralReducer) Close added in v1.3.0

func (r *FloatIntegralReducer) Close() error

Close flushes any in progress points to ensure any remaining points are emitted.

func (*FloatIntegralReducer) Emit added in v1.3.0

func (r *FloatIntegralReducer) Emit() []FloatPoint

Emit emits the time-integral of the aggregated points as a single point. InfluxQL convention dictates that outside a group-by-time clause we return a timestamp of zero. Within a group-by-time, we can set the time to ZeroTime and a higher level will change it to the start of the time group.

type FloatIterator added in v0.11.0

type FloatIterator interface {
	Iterator
	Next() (*FloatPoint, error)
}

FloatIterator represents a stream of float points.

type FloatMeanReducer added in v0.11.0

type FloatMeanReducer struct {
	// contains filtered or unexported fields
}

FloatMeanReducer calculates the mean of the aggregated points.

func NewFloatMeanReducer added in v0.11.0

func NewFloatMeanReducer() *FloatMeanReducer

NewFloatMeanReducer creates a new FloatMeanReducer.

func (*FloatMeanReducer) AggregateFloat added in v0.11.0

func (r *FloatMeanReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer.

func (*FloatMeanReducer) Emit added in v0.11.0

func (r *FloatMeanReducer) Emit() []FloatPoint

Emit emits the mean of the aggregated points as a single point.

type FloatMovingAverageReducer added in v0.12.0

type FloatMovingAverageReducer struct {
	// contains filtered or unexported fields
}

FloatMovingAverageReducer calculates the moving average of the aggregated points.

func NewFloatMovingAverageReducer added in v0.12.0

func NewFloatMovingAverageReducer(n int) *FloatMovingAverageReducer

NewFloatMovingAverageReducer creates a new FloatMovingAverageReducer.

func (*FloatMovingAverageReducer) AggregateFloat added in v0.12.0

func (r *FloatMovingAverageReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer and updates the current window.

func (*FloatMovingAverageReducer) Emit added in v0.12.0

Emit emits the moving average of the current window. Emit should be called after every call to AggregateFloat and it will produce one point if there is enough data to fill a window, otherwise it will produce zero points.

type FloatPoint added in v0.11.0

type FloatPoint struct {
	Name string
	Tags Tags

	Time  int64
	Nil   bool
	Value float64
	Aux   []interface{}

	// Total number of points that were combined into this point from an aggregate.
	// If this is zero, the point is not the result of an aggregate function.
	Aggregated uint32
}

FloatPoint represents a point with a float64 value. DO NOT ADD ADDITIONAL FIELDS TO THIS STRUCT. See TestPoint_Fields in influxql/point_test.go for more details.

func FloatMedianReduceSlice added in v0.11.0

func FloatMedianReduceSlice(a []FloatPoint) []FloatPoint

FloatMedianReduceSlice returns the median value within a window.

func FloatModeReduceSlice added in v1.0.0

func FloatModeReduceSlice(a []FloatPoint) []FloatPoint

FloatModeReduceSlice returns the mode value within a window.

func FloatSpreadReduceSlice added in v0.11.0

func FloatSpreadReduceSlice(a []FloatPoint) []FloatPoint

FloatSpreadReduceSlice returns the spread value within a window.

func FloatStddevReduceSlice added in v0.11.0

func FloatStddevReduceSlice(a []FloatPoint) []FloatPoint

FloatStddevReduceSlice returns the stddev value within a window.

func IntegerMedianReduceSlice added in v0.11.0

func IntegerMedianReduceSlice(a []IntegerPoint) []FloatPoint

IntegerMedianReduceSlice returns the median value within a window.

func IntegerStddevReduceSlice added in v0.11.0

func IntegerStddevReduceSlice(a []IntegerPoint) []FloatPoint

IntegerStddevReduceSlice returns the stddev value within a window.

func (*FloatPoint) Clone added in v0.11.0

func (v *FloatPoint) Clone() *FloatPoint

Clone returns a copy of v.

func (*FloatPoint) CopyTo added in v1.2.0

func (v *FloatPoint) CopyTo(other *FloatPoint)

CopyTo makes a deep copy into the point.

type FloatPointAggregator added in v0.11.0

type FloatPointAggregator interface {
	AggregateFloat(p *FloatPoint)
}

FloatPointAggregator aggregates points to produce a single point.

type FloatPointDecoder added in v0.11.0

type FloatPointDecoder struct {
	// contains filtered or unexported fields
}

FloatPointDecoder decodes FloatPoint points from a reader.

func NewFloatPointDecoder added in v0.11.0

func NewFloatPointDecoder(r io.Reader) *FloatPointDecoder

NewFloatPointDecoder returns a new instance of FloatPointDecoder that reads from r.

func (*FloatPointDecoder) DecodeFloatPoint added in v0.11.0

func (dec *FloatPointDecoder) DecodeFloatPoint(p *FloatPoint) error

DecodeFloatPoint reads from the underlying reader and unmarshals into p.

func (*FloatPointDecoder) Stats added in v0.12.0

func (dec *FloatPointDecoder) Stats() IteratorStats

Stats returns iterator stats embedded within the stream.

type FloatPointEmitter added in v0.11.0

type FloatPointEmitter interface {
	Emit() []FloatPoint
}

FloatPointEmitter produces a single point from an aggregate.

type FloatPointEncoder added in v0.11.0

type FloatPointEncoder struct {
	// contains filtered or unexported fields
}

FloatPointEncoder encodes FloatPoint points to a writer.

func NewFloatPointEncoder added in v0.11.0

func NewFloatPointEncoder(w io.Writer) *FloatPointEncoder

NewFloatPointEncoder returns a new instance of FloatPointEncoder that writes to w.

func (*FloatPointEncoder) EncodeFloatPoint added in v0.11.0

func (enc *FloatPointEncoder) EncodeFloatPoint(p *FloatPoint) error

EncodeFloatPoint marshals and writes p to the underlying writer.

type FloatReduceBooleanFunc added in v0.11.0

type FloatReduceBooleanFunc func(prev *BooleanPoint, curr *FloatPoint) (t int64, v bool, aux []interface{})

FloatReduceBooleanFunc is the function called by a FloatPoint reducer.

type FloatReduceBooleanSliceFunc added in v0.11.0

type FloatReduceBooleanSliceFunc func(a []FloatPoint) []BooleanPoint

FloatReduceBooleanSliceFunc is the function called by a FloatPoint reducer.

type FloatReduceFunc added in v0.11.0

type FloatReduceFunc func(prev *FloatPoint, curr *FloatPoint) (t int64, v float64, aux []interface{})

FloatReduceFunc is the function called by a FloatPoint reducer.

type FloatReduceIntegerFunc added in v0.11.0

type FloatReduceIntegerFunc func(prev *IntegerPoint, curr *FloatPoint) (t int64, v int64, aux []interface{})

FloatReduceIntegerFunc is the function called by a FloatPoint reducer.

type FloatReduceIntegerSliceFunc added in v0.11.0

type FloatReduceIntegerSliceFunc func(a []FloatPoint) []IntegerPoint

FloatReduceIntegerSliceFunc is the function called by a FloatPoint reducer.

type FloatReduceSliceFunc added in v0.11.0

type FloatReduceSliceFunc func(a []FloatPoint) []FloatPoint

FloatReduceSliceFunc is the function called by a FloatPoint reducer.

func NewFloatPercentileReduceSliceFunc added in v0.11.0

func NewFloatPercentileReduceSliceFunc(percentile float64) FloatReduceSliceFunc

NewFloatPercentileReduceSliceFunc returns the percentile value within a window.

type FloatReduceStringFunc added in v0.11.0

type FloatReduceStringFunc func(prev *StringPoint, curr *FloatPoint) (t int64, v string, aux []interface{})

FloatReduceStringFunc is the function called by a FloatPoint reducer.

type FloatReduceStringSliceFunc added in v0.11.0

type FloatReduceStringSliceFunc func(a []FloatPoint) []StringPoint

FloatReduceStringSliceFunc is the function called by a FloatPoint reducer.

type FloatSampleReducer added in v1.1.0

type FloatSampleReducer struct {
	// contains filtered or unexported fields
}

FloatSampleReducer implements a reservoir sampling to calculate a random subset of points

func NewFloatSampleReducer added in v1.1.0

func NewFloatSampleReducer(size int) *FloatSampleReducer

NewFloatSampleReducer creates a new FloatSampleReducer

func (*FloatSampleReducer) AggregateFloat added in v1.1.0

func (r *FloatSampleReducer) AggregateFloat(p *FloatPoint)

AggregateFloat aggregates a point into the reducer.

func (*FloatSampleReducer) Emit added in v1.1.0

func (r *FloatSampleReducer) Emit() []FloatPoint

Emit emits the reservoir sample as many points.

type FloatSliceFuncBooleanReducer added in v0.11.0

type FloatSliceFuncBooleanReducer struct {
	// contains filtered or unexported fields
}

FloatSliceFuncBooleanReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewFloatSliceFuncBooleanReducer added in v0.11.0

func NewFloatSliceFuncBooleanReducer(fn FloatReduceBooleanSliceFunc) *FloatSliceFuncBooleanReducer

NewFloatSliceFuncBooleanReducer creates a new FloatSliceFuncBooleanReducer.

func (*FloatSliceFuncBooleanReducer) AggregateFloat added in v0.11.0

func (r *FloatSliceFuncBooleanReducer) AggregateFloat(p *FloatPoint)

AggregateFloat copies the FloatPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*FloatSliceFuncBooleanReducer) AggregateFloatBulk added in v0.11.0

func (r *FloatSliceFuncBooleanReducer) AggregateFloatBulk(points []FloatPoint)

AggregateFloatBulk performs a bulk copy of FloatPoints into the internal slice. This is a more efficient version of calling AggregateFloat on each point.

func (*FloatSliceFuncBooleanReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type FloatSliceFuncIntegerReducer added in v0.11.0

type FloatSliceFuncIntegerReducer struct {
	// contains filtered or unexported fields
}

FloatSliceFuncIntegerReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewFloatSliceFuncIntegerReducer added in v0.11.0

func NewFloatSliceFuncIntegerReducer(fn FloatReduceIntegerSliceFunc) *FloatSliceFuncIntegerReducer

NewFloatSliceFuncIntegerReducer creates a new FloatSliceFuncIntegerReducer.

func (*FloatSliceFuncIntegerReducer) AggregateFloat added in v0.11.0

func (r *FloatSliceFuncIntegerReducer) AggregateFloat(p *FloatPoint)

AggregateFloat copies the FloatPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*FloatSliceFuncIntegerReducer) AggregateFloatBulk added in v0.11.0

func (r *FloatSliceFuncIntegerReducer) AggregateFloatBulk(points []FloatPoint)

AggregateFloatBulk performs a bulk copy of FloatPoints into the internal slice. This is a more efficient version of calling AggregateFloat on each point.

func (*FloatSliceFuncIntegerReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type FloatSliceFuncReducer added in v0.11.0

type FloatSliceFuncReducer struct {
	// contains filtered or unexported fields
}

FloatSliceFuncReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewFloatSliceFuncReducer added in v0.11.0

func NewFloatSliceFuncReducer(fn FloatReduceSliceFunc) *FloatSliceFuncReducer

NewFloatSliceFuncReducer creates a new FloatSliceFuncReducer.

func (*FloatSliceFuncReducer) AggregateFloat added in v0.11.0

func (r *FloatSliceFuncReducer) AggregateFloat(p *FloatPoint)

AggregateFloat copies the FloatPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*FloatSliceFuncReducer) AggregateFloatBulk added in v0.11.0

func (r *FloatSliceFuncReducer) AggregateFloatBulk(points []FloatPoint)

AggregateFloatBulk performs a bulk copy of FloatPoints into the internal slice. This is a more efficient version of calling AggregateFloat on each point.

func (*FloatSliceFuncReducer) Emit added in v0.11.0

func (r *FloatSliceFuncReducer) Emit() []FloatPoint

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type FloatSliceFuncStringReducer added in v0.11.0

type FloatSliceFuncStringReducer struct {
	// contains filtered or unexported fields
}

FloatSliceFuncStringReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewFloatSliceFuncStringReducer added in v0.11.0

func NewFloatSliceFuncStringReducer(fn FloatReduceStringSliceFunc) *FloatSliceFuncStringReducer

NewFloatSliceFuncStringReducer creates a new FloatSliceFuncStringReducer.

func (*FloatSliceFuncStringReducer) AggregateFloat added in v0.11.0

func (r *FloatSliceFuncStringReducer) AggregateFloat(p *FloatPoint)

AggregateFloat copies the FloatPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*FloatSliceFuncStringReducer) AggregateFloatBulk added in v0.11.0

func (r *FloatSliceFuncStringReducer) AggregateFloatBulk(points []FloatPoint)

AggregateFloatBulk performs a bulk copy of FloatPoints into the internal slice. This is a more efficient version of calling AggregateFloat on each point.

func (*FloatSliceFuncStringReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type FloatTopReducer added in v1.3.0

type FloatTopReducer struct {
	// contains filtered or unexported fields
}

func NewFloatTopReducer added in v1.3.0

func NewFloatTopReducer(n int) *FloatTopReducer

func (*FloatTopReducer) AggregateFloat added in v1.3.0

func (r *FloatTopReducer) AggregateFloat(p *FloatPoint)

func (*FloatTopReducer) Emit added in v1.3.0

func (r *FloatTopReducer) Emit() []FloatPoint

type GrantAdminStatement added in v0.9.2

type GrantAdminStatement struct {
	// Who to grant the privilege to.
	User string
}

GrantAdminStatement represents a command for granting admin privilege.

func (*GrantAdminStatement) RequiredPrivileges added in v0.9.2

func (s *GrantAdminStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a GrantAdminStatement.

func (*GrantAdminStatement) String added in v0.9.2

func (s *GrantAdminStatement) String() string

String returns a string representation of the grant admin statement.

type GrantStatement

type GrantStatement struct {
	// The privilege to be granted.
	Privilege Privilege

	// Database to grant the privilege to.
	On string

	// Who to grant the privilege to.
	User string
}

GrantStatement represents a command for granting a privilege.

func (*GrantStatement) DefaultDatabase added in v1.1.5

func (s *GrantStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*GrantStatement) RequiredPrivileges

func (s *GrantStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a GrantStatement.

func (*GrantStatement) String

func (s *GrantStatement) String() string

String returns a string representation of the grant statement.

type HasDefaultDatabase

type HasDefaultDatabase interface {
	Node

	DefaultDatabase() string
	// contains filtered or unexported methods
}

HasDefaultDatabase provides an interface to get the default database from a Statement.

type IntegerBottomReducer added in v1.3.0

type IntegerBottomReducer struct {
	// contains filtered or unexported fields
}

func NewIntegerBottomReducer added in v1.3.0

func NewIntegerBottomReducer(n int) *IntegerBottomReducer

func (*IntegerBottomReducer) AggregateInteger added in v1.3.0

func (r *IntegerBottomReducer) AggregateInteger(p *IntegerPoint)

func (*IntegerBottomReducer) Emit added in v1.3.0

func (r *IntegerBottomReducer) Emit() []IntegerPoint

type IntegerBulkPointAggregator added in v0.11.0

type IntegerBulkPointAggregator interface {
	AggregateIntegerBulk(points []IntegerPoint)
}

IntegerBulkPointAggregator aggregates multiple points at a time.

type IntegerCumulativeSumReducer added in v1.1.0

type IntegerCumulativeSumReducer struct {
	// contains filtered or unexported fields
}

IntegerCumulativeSumReducer cumulates the values from each point.

func NewIntegerCumulativeSumReducer added in v1.1.0

func NewIntegerCumulativeSumReducer() *IntegerCumulativeSumReducer

NewIntegerCumulativeSumReducer creates a new IntegerCumulativeSumReducer.

func (*IntegerCumulativeSumReducer) AggregateInteger added in v1.1.0

func (r *IntegerCumulativeSumReducer) AggregateInteger(p *IntegerPoint)

func (*IntegerCumulativeSumReducer) Emit added in v1.1.0

type IntegerDerivativeReducer added in v0.13.0

type IntegerDerivativeReducer struct {
	// contains filtered or unexported fields
}

IntegerDerivativeReducer calculates the derivative of the aggregated points.

func NewIntegerDerivativeReducer added in v0.13.0

func NewIntegerDerivativeReducer(interval Interval, isNonNegative, ascending bool) *IntegerDerivativeReducer

NewIntegerDerivativeReducer creates a new IntegerDerivativeReducer.

func (*IntegerDerivativeReducer) AggregateInteger added in v0.13.0

func (r *IntegerDerivativeReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer and updates the current window.

func (*IntegerDerivativeReducer) Emit added in v0.13.0

Emit emits the derivative of the reducer at the current point.

type IntegerDifferenceReducer added in v0.13.0

type IntegerDifferenceReducer struct {
	// contains filtered or unexported fields
}

IntegerDifferenceReducer calculates the derivative of the aggregated points.

func NewIntegerDifferenceReducer added in v0.13.0

func NewIntegerDifferenceReducer(isNonNegative bool) *IntegerDifferenceReducer

NewIntegerDifferenceReducer creates a new IntegerDifferenceReducer.

func (*IntegerDifferenceReducer) AggregateInteger added in v0.13.0

func (r *IntegerDifferenceReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer and updates the current window.

func (*IntegerDifferenceReducer) Emit added in v0.13.0

Emit emits the difference of the reducer at the current point.

type IntegerDistinctReducer added in v0.13.0

type IntegerDistinctReducer struct {
	// contains filtered or unexported fields
}

IntegerDistinctReducer returns the distinct points in a series.

func NewIntegerDistinctReducer added in v0.13.0

func NewIntegerDistinctReducer() *IntegerDistinctReducer

NewIntegerDistinctReducer creates a new IntegerDistinctReducer.

func (*IntegerDistinctReducer) AggregateInteger added in v0.13.0

func (r *IntegerDistinctReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer.

func (*IntegerDistinctReducer) Emit added in v0.13.0

Emit emits the distinct points that have been aggregated into the reducer.

type IntegerElapsedReducer added in v0.13.0

type IntegerElapsedReducer struct {
	// contains filtered or unexported fields
}

IntegerElapsedReducer calculates the elapsed of the aggregated points.

func NewIntegerElapsedReducer added in v0.13.0

func NewIntegerElapsedReducer(interval Interval) *IntegerElapsedReducer

NewIntegerElapsedReducer creates a new IntegerElapsedReducer.

func (*IntegerElapsedReducer) AggregateInteger added in v0.13.0

func (r *IntegerElapsedReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer and updates the current window.

func (*IntegerElapsedReducer) Emit added in v0.13.0

func (r *IntegerElapsedReducer) Emit() []IntegerPoint

Emit emits the elapsed of the reducer at the current point.

type IntegerFuncBooleanReducer added in v0.11.0

type IntegerFuncBooleanReducer struct {
	// contains filtered or unexported fields
}

IntegerFuncBooleanReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewIntegerFuncBooleanReducer added in v0.11.0

func NewIntegerFuncBooleanReducer(fn IntegerReduceBooleanFunc, prev *BooleanPoint) *IntegerFuncBooleanReducer

NewIntegerFuncBooleanReducer creates a new IntegerFuncBooleanReducer.

func (*IntegerFuncBooleanReducer) AggregateInteger added in v0.11.0

func (r *IntegerFuncBooleanReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger takes a IntegerPoint and invokes the reduce function with the current and new point to modify the current point.

func (*IntegerFuncBooleanReducer) Emit added in v0.11.0

Emit emits the point that was generated when reducing the points fed in with AggregateInteger.

type IntegerFuncFloatReducer added in v0.11.0

type IntegerFuncFloatReducer struct {
	// contains filtered or unexported fields
}

IntegerFuncFloatReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewIntegerFuncFloatReducer added in v0.11.0

func NewIntegerFuncFloatReducer(fn IntegerReduceFloatFunc, prev *FloatPoint) *IntegerFuncFloatReducer

NewIntegerFuncFloatReducer creates a new IntegerFuncFloatReducer.

func (*IntegerFuncFloatReducer) AggregateInteger added in v0.11.0

func (r *IntegerFuncFloatReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger takes a IntegerPoint and invokes the reduce function with the current and new point to modify the current point.

func (*IntegerFuncFloatReducer) Emit added in v0.11.0

func (r *IntegerFuncFloatReducer) Emit() []FloatPoint

Emit emits the point that was generated when reducing the points fed in with AggregateInteger.

type IntegerFuncReducer added in v0.11.0

type IntegerFuncReducer struct {
	// contains filtered or unexported fields
}

IntegerFuncReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewIntegerFuncReducer added in v0.11.0

func NewIntegerFuncReducer(fn IntegerReduceFunc, prev *IntegerPoint) *IntegerFuncReducer

NewIntegerFuncReducer creates a new IntegerFuncIntegerReducer.

func (*IntegerFuncReducer) AggregateInteger added in v0.11.0

func (r *IntegerFuncReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger takes a IntegerPoint and invokes the reduce function with the current and new point to modify the current point.

func (*IntegerFuncReducer) Emit added in v0.11.0

func (r *IntegerFuncReducer) Emit() []IntegerPoint

Emit emits the point that was generated when reducing the points fed in with AggregateInteger.

type IntegerFuncStringReducer added in v0.11.0

type IntegerFuncStringReducer struct {
	// contains filtered or unexported fields
}

IntegerFuncStringReducer is a reducer that reduces the passed in points to a single point using a reduce function.

func NewIntegerFuncStringReducer added in v0.11.0

func NewIntegerFuncStringReducer(fn IntegerReduceStringFunc, prev *StringPoint) *IntegerFuncStringReducer

NewIntegerFuncStringReducer creates a new IntegerFuncStringReducer.

func (*IntegerFuncStringReducer) AggregateInteger added in v0.11.0

func (r *IntegerFuncStringReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger takes a IntegerPoint and invokes the reduce function with the current and new point to modify the current point.

func (*IntegerFuncStringReducer) Emit added in v0.11.0

Emit emits the point that was generated when reducing the points fed in with AggregateInteger.

type IntegerIntegralReducer added in v1.3.0

type IntegerIntegralReducer struct {
	// contains filtered or unexported fields
}

IntegerIntegralReducer calculates the time-integral of the aggregated points.

func NewIntegerIntegralReducer added in v1.3.0

func NewIntegerIntegralReducer(interval Interval, opt IteratorOptions) *IntegerIntegralReducer

NewIntegerIntegralReducer creates a new IntegerIntegralReducer.

func (*IntegerIntegralReducer) AggregateInteger added in v1.3.0

func (r *IntegerIntegralReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer.

func (*IntegerIntegralReducer) Close added in v1.3.0

func (r *IntegerIntegralReducer) Close() error

Close flushes any in progress points to ensure any remaining points are emitted.

func (*IntegerIntegralReducer) Emit added in v1.3.0

func (r *IntegerIntegralReducer) Emit() []FloatPoint

Emit emits the time-integral of the aggregated points as a single FLOAT point InfluxQL convention dictates that outside a group-by-time clause we return a timestamp of zero. Within a group-by-time, we can set the time to ZeroTime and a higher level will change it to the start of the time group.

type IntegerIterator added in v0.11.0

type IntegerIterator interface {
	Iterator
	Next() (*IntegerPoint, error)
}

IntegerIterator represents a stream of integer points.

type IntegerLiteral added in v0.12.0

type IntegerLiteral struct {
	Val int64
}

IntegerLiteral represents an integer literal.

func (*IntegerLiteral) String added in v0.12.0

func (l *IntegerLiteral) String() string

String returns a string representation of the literal.

type IntegerMeanReducer added in v0.11.0

type IntegerMeanReducer struct {
	// contains filtered or unexported fields
}

IntegerMeanReducer calculates the mean of the aggregated points.

func NewIntegerMeanReducer added in v0.11.0

func NewIntegerMeanReducer() *IntegerMeanReducer

NewIntegerMeanReducer creates a new IntegerMeanReducer.

func (*IntegerMeanReducer) AggregateInteger added in v0.11.0

func (r *IntegerMeanReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer.

func (*IntegerMeanReducer) Emit added in v0.11.0

func (r *IntegerMeanReducer) Emit() []FloatPoint

Emit emits the mean of the aggregated points as a single point.

type IntegerMovingAverageReducer added in v0.12.0

type IntegerMovingAverageReducer struct {
	// contains filtered or unexported fields
}

IntegerMovingAverageReducer calculates the moving average of the aggregated points.

func NewIntegerMovingAverageReducer added in v0.12.0

func NewIntegerMovingAverageReducer(n int) *IntegerMovingAverageReducer

NewIntegerMovingAverageReducer creates a new IntegerMovingAverageReducer.

func (*IntegerMovingAverageReducer) AggregateInteger added in v0.12.0

func (r *IntegerMovingAverageReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer and updates the current window.

func (*IntegerMovingAverageReducer) Emit added in v0.12.0

Emit emits the moving average of the current window. Emit should be called after every call to AggregateInteger and it will produce one point if there is enough data to fill a window, otherwise it will produce zero points.

type IntegerPoint added in v0.11.0

type IntegerPoint struct {
	Name string
	Tags Tags

	Time  int64
	Nil   bool
	Value int64
	Aux   []interface{}

	// Total number of points that were combined into this point from an aggregate.
	// If this is zero, the point is not the result of an aggregate function.
	Aggregated uint32
}

IntegerPoint represents a point with a int64 value. DO NOT ADD ADDITIONAL FIELDS TO THIS STRUCT. See TestPoint_Fields in influxql/point_test.go for more details.

func IntegerModeReduceSlice added in v1.0.0

func IntegerModeReduceSlice(a []IntegerPoint) []IntegerPoint

IntegerModeReduceSlice returns the mode value within a window.

func IntegerSpreadReduceSlice added in v0.11.0

func IntegerSpreadReduceSlice(a []IntegerPoint) []IntegerPoint

IntegerSpreadReduceSlice returns the spread value within a window.

func (*IntegerPoint) Clone added in v0.11.0

func (v *IntegerPoint) Clone() *IntegerPoint

Clone returns a copy of v.

func (*IntegerPoint) CopyTo added in v1.2.0

func (v *IntegerPoint) CopyTo(other *IntegerPoint)

CopyTo makes a deep copy into the point.

type IntegerPointAggregator added in v0.11.0

type IntegerPointAggregator interface {
	AggregateInteger(p *IntegerPoint)
}

IntegerPointAggregator aggregates points to produce a single point.

type IntegerPointDecoder added in v0.11.0

type IntegerPointDecoder struct {
	// contains filtered or unexported fields
}

IntegerPointDecoder decodes IntegerPoint points from a reader.

func NewIntegerPointDecoder added in v0.11.0

func NewIntegerPointDecoder(r io.Reader) *IntegerPointDecoder

NewIntegerPointDecoder returns a new instance of IntegerPointDecoder that reads from r.

func (*IntegerPointDecoder) DecodeIntegerPoint added in v0.11.0

func (dec *IntegerPointDecoder) DecodeIntegerPoint(p *IntegerPoint) error

DecodeIntegerPoint reads from the underlying reader and unmarshals into p.

func (*IntegerPointDecoder) Stats added in v0.12.0

func (dec *IntegerPointDecoder) Stats() IteratorStats

Stats returns iterator stats embedded within the stream.

type IntegerPointEmitter added in v0.11.0

type IntegerPointEmitter interface {
	Emit() []IntegerPoint
}

IntegerPointEmitter produces a single point from an aggregate.

type IntegerPointEncoder added in v0.11.0

type IntegerPointEncoder struct {
	// contains filtered or unexported fields
}

IntegerPointEncoder encodes IntegerPoint points to a writer.

func NewIntegerPointEncoder added in v0.11.0

func NewIntegerPointEncoder(w io.Writer) *IntegerPointEncoder

NewIntegerPointEncoder returns a new instance of IntegerPointEncoder that writes to w.

func (*IntegerPointEncoder) EncodeIntegerPoint added in v0.11.0

func (enc *IntegerPointEncoder) EncodeIntegerPoint(p *IntegerPoint) error

EncodeIntegerPoint marshals and writes p to the underlying writer.

type IntegerReduceBooleanFunc added in v0.11.0

type IntegerReduceBooleanFunc func(prev *BooleanPoint, curr *IntegerPoint) (t int64, v bool, aux []interface{})

IntegerReduceBooleanFunc is the function called by a IntegerPoint reducer.

type IntegerReduceBooleanSliceFunc added in v0.11.0

type IntegerReduceBooleanSliceFunc func(a []IntegerPoint) []BooleanPoint

IntegerReduceBooleanSliceFunc is the function called by a IntegerPoint reducer.

type IntegerReduceFloatFunc added in v0.11.0

type IntegerReduceFloatFunc func(prev *FloatPoint, curr *IntegerPoint) (t int64, v float64, aux []interface{})

IntegerReduceFloatFunc is the function called by a IntegerPoint reducer.

type IntegerReduceFloatSliceFunc added in v0.11.0

type IntegerReduceFloatSliceFunc func(a []IntegerPoint) []FloatPoint

IntegerReduceFloatSliceFunc is the function called by a IntegerPoint reducer.

type IntegerReduceFunc added in v0.11.0

type IntegerReduceFunc func(prev *IntegerPoint, curr *IntegerPoint) (t int64, v int64, aux []interface{})

IntegerReduceFunc is the function called by a IntegerPoint reducer.

type IntegerReduceSliceFunc added in v0.11.0

type IntegerReduceSliceFunc func(a []IntegerPoint) []IntegerPoint

IntegerReduceSliceFunc is the function called by a IntegerPoint reducer.

func NewIntegerPercentileReduceSliceFunc added in v0.11.0

func NewIntegerPercentileReduceSliceFunc(percentile float64) IntegerReduceSliceFunc

NewIntegerPercentileReduceSliceFunc returns the percentile value within a window.

type IntegerReduceStringFunc added in v0.11.0

type IntegerReduceStringFunc func(prev *StringPoint, curr *IntegerPoint) (t int64, v string, aux []interface{})

IntegerReduceStringFunc is the function called by a IntegerPoint reducer.

type IntegerReduceStringSliceFunc added in v0.11.0

type IntegerReduceStringSliceFunc func(a []IntegerPoint) []StringPoint

IntegerReduceStringSliceFunc is the function called by a IntegerPoint reducer.

type IntegerSampleReducer added in v1.1.0

type IntegerSampleReducer struct {
	// contains filtered or unexported fields
}

IntegerSampleReducer implements a reservoir sampling to calculate a random subset of points

func NewIntegerSampleReducer added in v1.1.0

func NewIntegerSampleReducer(size int) *IntegerSampleReducer

NewIntegerSampleReducer creates a new IntegerSampleReducer

func (*IntegerSampleReducer) AggregateInteger added in v1.1.0

func (r *IntegerSampleReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger aggregates a point into the reducer.

func (*IntegerSampleReducer) Emit added in v1.1.0

func (r *IntegerSampleReducer) Emit() []IntegerPoint

Emit emits the reservoir sample as many points.

type IntegerSliceFuncBooleanReducer added in v0.11.0

type IntegerSliceFuncBooleanReducer struct {
	// contains filtered or unexported fields
}

IntegerSliceFuncBooleanReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewIntegerSliceFuncBooleanReducer added in v0.11.0

func NewIntegerSliceFuncBooleanReducer(fn IntegerReduceBooleanSliceFunc) *IntegerSliceFuncBooleanReducer

NewIntegerSliceFuncBooleanReducer creates a new IntegerSliceFuncBooleanReducer.

func (*IntegerSliceFuncBooleanReducer) AggregateInteger added in v0.11.0

func (r *IntegerSliceFuncBooleanReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger copies the IntegerPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*IntegerSliceFuncBooleanReducer) AggregateIntegerBulk added in v0.11.0

func (r *IntegerSliceFuncBooleanReducer) AggregateIntegerBulk(points []IntegerPoint)

AggregateIntegerBulk performs a bulk copy of IntegerPoints into the internal slice. This is a more efficient version of calling AggregateInteger on each point.

func (*IntegerSliceFuncBooleanReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type IntegerSliceFuncFloatReducer added in v0.11.0

type IntegerSliceFuncFloatReducer struct {
	// contains filtered or unexported fields
}

IntegerSliceFuncFloatReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewIntegerSliceFuncFloatReducer added in v0.11.0

func NewIntegerSliceFuncFloatReducer(fn IntegerReduceFloatSliceFunc) *IntegerSliceFuncFloatReducer

NewIntegerSliceFuncFloatReducer creates a new IntegerSliceFuncFloatReducer.

func (*IntegerSliceFuncFloatReducer) AggregateInteger added in v0.11.0

func (r *IntegerSliceFuncFloatReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger copies the IntegerPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*IntegerSliceFuncFloatReducer) AggregateIntegerBulk added in v0.11.0

func (r *IntegerSliceFuncFloatReducer) AggregateIntegerBulk(points []IntegerPoint)

AggregateIntegerBulk performs a bulk copy of IntegerPoints into the internal slice. This is a more efficient version of calling AggregateInteger on each point.

func (*IntegerSliceFuncFloatReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type IntegerSliceFuncReducer added in v0.11.0

type IntegerSliceFuncReducer struct {
	// contains filtered or unexported fields
}

IntegerSliceFuncReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewIntegerSliceFuncReducer added in v0.11.0

func NewIntegerSliceFuncReducer(fn IntegerReduceSliceFunc) *IntegerSliceFuncReducer

NewIntegerSliceFuncReducer creates a new IntegerSliceFuncReducer.

func (*IntegerSliceFuncReducer) AggregateInteger added in v0.11.0

func (r *IntegerSliceFuncReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger copies the IntegerPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*IntegerSliceFuncReducer) AggregateIntegerBulk added in v0.11.0

func (r *IntegerSliceFuncReducer) AggregateIntegerBulk(points []IntegerPoint)

AggregateIntegerBulk performs a bulk copy of IntegerPoints into the internal slice. This is a more efficient version of calling AggregateInteger on each point.

func (*IntegerSliceFuncReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type IntegerSliceFuncStringReducer added in v0.11.0

type IntegerSliceFuncStringReducer struct {
	// contains filtered or unexported fields
}

IntegerSliceFuncStringReducer is a reducer that aggregates the passed in points and then invokes the function to reduce the points when they are emitted.

func NewIntegerSliceFuncStringReducer added in v0.11.0

func NewIntegerSliceFuncStringReducer(fn IntegerReduceStringSliceFunc) *IntegerSliceFuncStringReducer

NewIntegerSliceFuncStringReducer creates a new IntegerSliceFuncStringReducer.

func (*IntegerSliceFuncStringReducer) AggregateInteger added in v0.11.0

func (r *IntegerSliceFuncStringReducer) AggregateInteger(p *IntegerPoint)

AggregateInteger copies the IntegerPoint into the internal slice to be passed to the reduce function when Emit is called.

func (*IntegerSliceFuncStringReducer) AggregateIntegerBulk added in v0.11.0

func (r *IntegerSliceFuncStringReducer) AggregateIntegerBulk(points []IntegerPoint)

AggregateIntegerBulk performs a bulk copy of IntegerPoints into the internal slice. This is a more efficient version of calling AggregateInteger on each point.

func (*IntegerSliceFuncStringReducer) Emit added in v0.11.0

Emit invokes the reduce function on the aggregated points to generate the aggregated points. This method does not clear the points from the internal slice.

type IntegerTopReducer added in v1.3.0

type IntegerTopReducer struct {
	// contains filtered or unexported fields
}

func NewIntegerTopReducer added in v1.3.0

func NewIntegerTopReducer(n int) *IntegerTopReducer

func (*IntegerTopReducer) AggregateInteger added in v1.3.0

func (r *IntegerTopReducer) AggregateInteger(p *IntegerPoint)

func (*IntegerTopReducer) Emit added in v1.3.0

func (r *IntegerTopReducer) Emit() []IntegerPoint

type Interval added in v0.11.0

type Interval struct {
	Duration time.Duration
	Offset   time.Duration
}

Interval represents a repeating interval for a query.

func (Interval) IsZero added in v0.11.0

func (i Interval) IsZero() bool

IsZero returns true if the interval has no duration.

type Iterator

type Iterator interface {
	Stats() IteratorStats
	Close() error
}

Iterator represents a generic interface for all Iterators. Most iterator operations are done on the typed sub-interfaces.

func NewCallIterator added in v0.11.0

func NewCallIterator(input Iterator, opt IteratorOptions) (Iterator, error)

NewCallIterator returns a new iterator for a Call.

func NewCloseInterruptIterator added in v1.0.0

func NewCloseInterruptIterator(input Iterator, closing <-chan struct{}) Iterator

NewCloseInterruptIterator returns an iterator that will invoke the Close() method on an iterator when the passed-in channel has been closed.

func NewDedupeIterator added in v0.11.0

func NewDedupeIterator(input Iterator) Iterator

NewDedupeIterator returns an iterator that only outputs unique points. This iterator maintains a serialized copy of each row so it is inefficient to use on large datasets. It is intended for small datasets such as meta queries.

func NewDistinctIterator added in v0.11.0

func NewDistinctIterator(input Iterator, opt IteratorOptions) (Iterator, error)

NewDistinctIterator returns an iterator for operating on a distinct() call.

func NewFillIterator added in v0.11.0

func NewFillIterator(input Iterator, expr Expr, opt IteratorOptions) Iterator

NewFillIterator returns an iterator that fills in missing points in an aggregate.

func NewFilterIterator added in v1.2.0

func NewFilterIterator(input Iterator, cond Expr, opt IteratorOptions) Iterator

NewFilterIterator returns an iterator that filters the points based on the condition. This iterator is not nearly as efficient as filtering points within the query engine and is only used when filtering subqueries.

func NewInterruptIterator added in v0.12.0

func NewInterruptIterator(input Iterator, closing <-chan struct{}) Iterator

NewInterruptIterator returns an iterator that will stop producing output when the passed-in channel is closed.

func NewIntervalIterator added in v0.11.0

func NewIntervalIterator(input Iterator, opt IteratorOptions) Iterator

NewIntervalIterator returns an iterator that sets the time on each point to the interval.

func NewIteratorMapper added in v1.2.0

func NewIteratorMapper(itrs []Iterator, driver IteratorMap, fields []IteratorMap, opt IteratorOptions) Iterator

func NewLimitIterator added in v0.11.0

func NewLimitIterator(input Iterator, opt IteratorOptions) Iterator

NewLimitIterator returns an iterator that limits the number of points per grouping.

func NewMedianIterator added in v1.0.0

func NewMedianIterator(input Iterator, opt IteratorOptions) (Iterator, error)

NewMedianIterator returns an iterator for operating on a median() call.

func NewMergeIterator added in v0.11.0

func NewMergeIterator(inputs []Iterator, opt IteratorOptions) Iterator

NewMergeIterator returns an iterator to merge itrs into one. Inputs must either be merge iterators or only contain a single name/tag in sorted order. The iterator will output all points by window, name/tag, then time. This iterator is useful when you need all of the points for an interval.

func NewModeIterator added in v1.0.0

func NewModeIterator(input Iterator, opt IteratorOptions) (Iterator, error)

newModeIterator returns an iterator for operating on a mode() call.

func NewParallelMergeIterator added in v1.0.0

func NewParallelMergeIterator(inputs []Iterator, opt IteratorOptions, parallelism int) Iterator

NewParallelMergeIterator returns an iterator that breaks input iterators into groups and processes them in parallel.

func NewReaderIterator added in v0.11.0

func NewReaderIterator(r io.Reader, typ DataType, stats IteratorStats) Iterator

NewReaderIterator returns an iterator that streams from a reader.

func NewSampleIterator added in v1.1.0

func NewSampleIterator(input Iterator, opt IteratorOptions, size int) (Iterator, error)

NewSampleIterator returns an iterator for operating on a sample() call (exported for use in test).

func NewSortedMergeIterator added in v0.11.0

func NewSortedMergeIterator(inputs []Iterator, opt IteratorOptions) Iterator

NewSortedMergeIterator returns an iterator to merge itrs into one. Inputs must either be sorted merge iterators or only contain a single name/tag in sorted order. The iterator will output all points by name/tag, then time. This iterator is useful when you need all points for a name/tag to be in order.

func Select added in v0.11.0

func Select(stmt *SelectStatement, ic IteratorCreator, sopt *SelectOptions) ([]Iterator, error)

Select executes stmt against ic and returns a list of iterators to stream from.

Statements should have all rewriting performed before calling select(). This includes wildcard and source expansion.

type IteratorCreator added in v0.11.0

type IteratorCreator interface {
	// Creates a simple iterator for use in an InfluxQL query.
	CreateIterator(source *Measurement, opt IteratorOptions) (Iterator, error)
}

IteratorCreator is an interface to create Iterators.

type IteratorEncoder added in v0.11.0

type IteratorEncoder struct {

	// Frequency with which stats are emitted.
	StatsInterval time.Duration
	// contains filtered or unexported fields
}

IteratorEncoder is an encoder for encoding an iterator's points to w.

func NewIteratorEncoder added in v0.11.0

func NewIteratorEncoder(w io.Writer) *IteratorEncoder

NewIteratorEncoder encodes an iterator's points to w.

func (*IteratorEncoder) EncodeIterator added in v0.11.0

func (enc *IteratorEncoder) EncodeIterator(itr Iterator) error

EncodeIterator encodes and writes all of itr's points to the underlying writer.

type IteratorMap added in v1.2.1

type IteratorMap interface {
	Value(tags Tags, buf []interface{}) interface{}
}

type IteratorOptions added in v0.11.0

type IteratorOptions struct {
	// Expression to iterate for.
	// This can be VarRef or a Call.
	Expr Expr

	// Auxilary tags or values to also retrieve for the point.
	Aux []VarRef

	// Data sources from which to receive data. This is only used for encoding
	// measurements over RPC and is no longer used in the open source version.
	Sources []Source

	// Group by interval and tags.
	Interval   Interval
	Dimensions []string            // The final dimensions of the query (stays the same even in subqueries).
	GroupBy    map[string]struct{} // Dimensions to group points by in intermediate iterators.
	Location   *time.Location

	// Fill options.
	Fill      FillOption
	FillValue interface{}

	// Condition to filter by.
	Condition Expr

	// Time range for the iterator.
	StartTime int64
	EndTime   int64

	// Sorted in time ascending order if true.
	Ascending bool

	// Limits the number of points per series.
	Limit, Offset int

	// Limits the number of series.
	SLimit, SOffset int

	// Removes duplicate rows from raw queries.
	Dedupe bool

	// Determines if this is a query for raw data or an aggregate/selector.
	Ordered bool

	// Limits on the creation of iterators.
	MaxSeriesN int

	// If this channel is set and is closed, the iterator should try to exit
	// and close as soon as possible.
	InterruptCh <-chan struct{}

	// Authorizer can limit access to data
	Authorizer Authorizer
}

IteratorOptions is an object passed to CreateIterator to specify creation options.

func (IteratorOptions) DerivativeInterval added in v0.11.0

func (opt IteratorOptions) DerivativeInterval() Interval

DerivativeInterval returns the time interval for the derivative function.

func (IteratorOptions) ElapsedInterval added in v0.13.0

func (opt IteratorOptions) ElapsedInterval() Interval

ElapsedInterval returns the time interval for the elapsed function.

func (IteratorOptions) GetDimensions added in v1.2.0

func (opt IteratorOptions) GetDimensions() []string

GetDimensions retrieves the dimensions for this query.

func (IteratorOptions) IntegralInterval added in v1.3.0

func (opt IteratorOptions) IntegralInterval() Interval

IntegralInterval returns the time interval for the integral function.

func (*IteratorOptions) MarshalBinary added in v0.11.0

func (opt *IteratorOptions) MarshalBinary() ([]byte, error)

MarshalBinary encodes opt into a binary format.

func (IteratorOptions) MergeSorted added in v0.11.0

func (opt IteratorOptions) MergeSorted() bool

MergeSorted returns true if the options require a sorted merge.

func (IteratorOptions) SeekTime added in v0.11.0

func (opt IteratorOptions) SeekTime() int64

SeekTime returns the time the iterator should start from. For ascending iterators this is the start time, for descending iterators it's the end time.

func (*IteratorOptions) UnmarshalBinary added in v0.11.0

func (opt *IteratorOptions) UnmarshalBinary(buf []byte) error

UnmarshalBinary decodes from a binary format in to opt.

func (IteratorOptions) Window added in v0.11.0

func (opt IteratorOptions) Window(t int64) (start, end int64)

Window returns the time window [start,end) that t falls within.

func (*IteratorOptions) Zone added in v1.3.0

func (opt *IteratorOptions) Zone(ns int64) (string, int64)

Zone returns the zone information for the given time. The offset is in nanoseconds.

type IteratorStats added in v0.12.0

type IteratorStats struct {
	SeriesN int // series represented
	PointN  int // points returned
}

IteratorStats represents statistics about an iterator. Some statistics are available immediately upon iterator creation while some are derived as the iterator processes data.

func (*IteratorStats) Add added in v0.12.0

func (s *IteratorStats) Add(other IteratorStats)

Add aggregates fields from s and other together. Overwrites s.

type Iterators added in v0.11.0

type Iterators []Iterator

Iterators represents a list of iterators.

func (Iterators) Close added in v0.11.0

func (a Iterators) Close() error

Close closes all iterators.

func (Iterators) Merge added in v1.0.0

func (a Iterators) Merge(opt IteratorOptions) (Iterator, error)

Merge combines all iterators into a single iterator. A sorted merge iterator or a merge iterator can be used based on opt.

func (Iterators) Stats added in v0.12.0

func (a Iterators) Stats() IteratorStats

Stats returns the aggregation of all iterator stats.

type KillQueryStatement added in v0.12.0

type KillQueryStatement struct {
	// The query to kill.
	QueryID uint64

	// The host to delegate the kill to.
	Host string
}

KillQueryStatement represents a command for killing a query.

func (*KillQueryStatement) RequiredPrivileges added in v0.12.0

func (s *KillQueryStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a KillQueryStatement.

func (*KillQueryStatement) String added in v0.12.0

func (s *KillQueryStatement) String() string

String returns a string representation of the kill query statement.

type ListLiteral added in v1.0.0

type ListLiteral struct {
	Vals []string
}

ListLiteral represents a list of tag key literals.

func (*ListLiteral) String added in v1.0.0

func (s *ListLiteral) String() string

String returns a string representation of the literal.

type Literal added in v0.11.0

type Literal interface {
	Expr
	// contains filtered or unexported methods
}

Literal represents a static literal.

type Measurement

type Measurement struct {
	Database        string
	RetentionPolicy string
	Name            string
	Regex           *RegexLiteral
	IsTarget        bool
}

Measurement represents a single measurement used as a datasource.

func (*Measurement) String

func (m *Measurement) String() string

String returns a string representation of the measurement.

type Measurements

type Measurements []*Measurement

Measurements represents a list of measurements.

func (Measurements) String

func (a Measurements) String() string

String returns a string representation of the measurements.

type Message added in v0.13.0

type Message struct {
	Level string `json:"level"`
	Text  string `json:"text"`
}

Message represents a user-facing message to be included with the result.

func ReadOnlyWarning added in v0.13.0

func ReadOnlyWarning(stmt string) *Message

ReadOnlyWarning generates a warning message that tells the user the command they are using is being used for writing in a read only context.

This is a temporary method while to be used while transitioning to read only operations for issue #6290.

type Node

type Node interface {
	String() string
	// contains filtered or unexported methods
}

Node represents a node in the InfluxDB abstract syntax tree.

func Rewrite

func Rewrite(r Rewriter, node Node) Node

Rewrite recursively invokes the rewriter to replace each node. Nodes are traversed depth-first and rewritten from leaf to root.

func RewriteFunc

func RewriteFunc(node Node, fn func(Node) Node) Node

RewriteFunc rewrites a node hierarchy.

type NowValuer

type NowValuer struct {
	Now      time.Time
	Location *time.Location
}

NowValuer returns only the value for "now()".

func (*NowValuer) Value

func (v *NowValuer) Value(key string) (interface{}, bool)

Value is a method that returns the value and existence flag for a given key.

func (*NowValuer) Zone added in v1.3.4

func (v *NowValuer) Zone() *time.Location

Zone is a method that returns the time.Location.

type NullMap added in v1.3.0

type NullMap struct{}

func (NullMap) Value added in v1.3.0

func (NullMap) Value(tags Tags, buf []interface{}) interface{}

type NumberLiteral

type NumberLiteral struct {
	Val float64
}

NumberLiteral represents a numeric literal.

func (*NumberLiteral) String

func (l *NumberLiteral) String() string

String returns a string representation of the literal.

type OpenAuthorizer added in v1.3.0

type OpenAuthorizer struct{}

OpenAuthorizer is the Authorizer used when authorization is disabled. It allows all operations.

func (OpenAuthorizer) AuthorizeDatabase added in v1.3.0

func (_ OpenAuthorizer) AuthorizeDatabase(Privilege, string) bool

AuthorizeDatabase returns true to allow any operation on a database.

func (OpenAuthorizer) AuthorizeQuery added in v1.3.0

func (_ OpenAuthorizer) AuthorizeQuery(_ string, _ *Query) error

func (OpenAuthorizer) AuthorizeSeriesRead added in v1.3.0

func (_ OpenAuthorizer) AuthorizeSeriesRead(database string, measurement []byte, tags models.Tags) bool

func (OpenAuthorizer) AuthorizeSeriesWrite added in v1.3.0

func (_ OpenAuthorizer) AuthorizeSeriesWrite(database string, measurement []byte, tags models.Tags) bool

type ParenExpr

type ParenExpr struct {
	Expr Expr
}

ParenExpr represents a parenthesized expression.

func (*ParenExpr) String

func (e *ParenExpr) String() string

String returns a string representation of the parenthesized expression.

type ParseError

type ParseError struct {
	Message  string
	Found    string
	Expected []string
	Pos      Pos
}

ParseError represents an error that occurred during parsing.

func (*ParseError) Error

func (e *ParseError) Error() string

Error returns the string representation of the error.

type Parser

type Parser struct {
	// contains filtered or unexported fields
}

Parser represents an InfluxQL parser.

func NewParser

func NewParser(r io.Reader) *Parser

NewParser returns a new instance of Parser.

func (*Parser) ParseExpr

func (p *Parser) ParseExpr() (Expr, error)

ParseExpr parses an expression.

func (*Parser) ParseQuery

func (p *Parser) ParseQuery() (*Query, error)

ParseQuery parses an InfluxQL string and returns a Query AST object.

func (*Parser) ParseStatement

func (p *Parser) ParseStatement() (Statement, error)

ParseStatement parses an InfluxQL string and returns a Statement AST object.

func (*Parser) SetParams added in v1.0.0

func (p *Parser) SetParams(params map[string]interface{})

SetParams sets the parameters that will be used for any bound parameter substitutions.

type Point added in v0.11.0

type Point interface {
	// contains filtered or unexported methods
}

Point represents a value in a series that occurred at a given time.

type PointDecoder added in v0.11.0

type PointDecoder struct {
	// contains filtered or unexported fields
}

PointDecoder decodes generic points from a reader.

func NewPointDecoder added in v0.11.0

func NewPointDecoder(r io.Reader) *PointDecoder

NewPointDecoder returns a new instance of PointDecoder that reads from r.

func (*PointDecoder) DecodePoint added in v0.11.0

func (dec *PointDecoder) DecodePoint(p *Point) error

DecodePoint reads from the underlying reader and unmarshals into p.

func (*PointDecoder) Stats added in v0.12.0

func (dec *PointDecoder) Stats() IteratorStats

Stats returns iterator stats embedded within the stream.

type Points added in v0.11.0

type Points []Point

Points represents a list of points.

func (Points) Clone added in v0.13.0

func (a Points) Clone() []Point

Clone returns a deep copy of a.

type Pos

type Pos struct {
	Line int
	Char int
}

Pos specifies the line and character position of a token. The Char and Line are both zero-based indexes.

type Privilege

type Privilege int

Privilege is a type of action a user can be granted the right to use.

const (
	// NoPrivileges means no privileges required / granted / revoked.
	NoPrivileges Privilege = iota
	// ReadPrivilege means read privilege required / granted / revoked.
	ReadPrivilege
	// WritePrivilege means write privilege required / granted / revoked.
	WritePrivilege
	// AllPrivileges means all privileges required / granted / revoked.
	AllPrivileges
)

func NewPrivilege

func NewPrivilege(p Privilege) *Privilege

NewPrivilege returns an initialized *Privilege.

func (Privilege) String

func (p Privilege) String() string

String returns a string representation of a Privilege.

type Query

type Query struct {
	Statements Statements
}

Query represents a collection of ordered statements.

func ParseQuery

func ParseQuery(s string) (*Query, error)

ParseQuery parses a query string and returns its AST representation.

func (*Query) String

func (q *Query) String() string

String returns a string representation of the query.

type QueryExecutor added in v0.11.0

type QueryExecutor struct {
	// Used for executing a statement in the query.
	StatementExecutor StatementExecutor

	// Used for tracking running queries.
	TaskManager *TaskManager

	// Logger to use for all logging.
	// Defaults to discarding all log output.
	Logger zap.Logger
	// contains filtered or unexported fields
}

QueryExecutor executes every statement in an Query.

func NewQueryExecutor added in v0.13.0

func NewQueryExecutor() *QueryExecutor

NewQueryExecutor returns a new instance of QueryExecutor.

func (*QueryExecutor) Close added in v0.13.0

func (e *QueryExecutor) Close() error

Close kills all running queries and prevents new queries from being attached.

func (*QueryExecutor) ExecuteQuery added in v0.11.0

func (e *QueryExecutor) ExecuteQuery(query *Query, opt ExecutionOptions, closing chan struct{}) <-chan *Result

ExecuteQuery executes each statement within a query.

func (*QueryExecutor) Statistics added in v1.0.0

func (e *QueryExecutor) Statistics(tags map[string]string) []models.Statistic

Statistics returns statistics for periodic monitoring.

func (*QueryExecutor) WithLogger added in v1.2.0

func (e *QueryExecutor) WithLogger(log zap.Logger)

SetLogOutput sets the writer to which all logs are written. It must not be called after Open is called.

type QueryInfo added in v1.0.0

type QueryInfo struct {
	ID       uint64        `json:"id"`
	Query    string        `json:"query"`
	Database string        `json:"database"`
	Duration time.Duration `json:"duration"`
}

QueryInfo represents the information for a query.

type QueryMonitorFunc added in v0.12.0

type QueryMonitorFunc func(<-chan struct{}) error

QueryMonitorFunc is a function that will be called to check if a query is currently healthy. If the query needs to be interrupted for some reason, the error should be returned by this function.

func PointLimitMonitor added in v0.12.0

func PointLimitMonitor(itrs Iterators, interval time.Duration, limit int) QueryMonitorFunc

PointLimitMonitor is a query monitor that exits when the number of points emitted exceeds a threshold.

type QueryStatistics added in v1.0.0

type QueryStatistics struct {
	ActiveQueries          int64
	ExecutedQueries        int64
	FinishedQueries        int64
	QueryExecutionDuration int64
}

QueryStatistics keeps statistics related to the QueryExecutor.

type QueryTask added in v0.13.0

type QueryTask struct {
	// contains filtered or unexported fields
}

QueryTask is the internal data structure for managing queries. For the public use data structure that gets returned, see QueryTask.

func (*QueryTask) Error added in v0.13.0

func (q *QueryTask) Error() error

Error returns any asynchronous error that may have occured while executing the query.

func (*QueryTask) Monitor added in v0.13.0

func (q *QueryTask) Monitor(fn QueryMonitorFunc)

Monitor starts a new goroutine that will monitor a query. The function will be passed in a channel to signal when the query has been finished normally. If the function returns with an error and the query is still running, the query will be terminated.

type RegexLiteral

type RegexLiteral struct {
	Val *regexp.Regexp
}

RegexLiteral represents a regular expression.

func CloneRegexLiteral

func CloneRegexLiteral(r *RegexLiteral) *RegexLiteral

CloneRegexLiteral returns a clone of the RegexLiteral.

func (*RegexLiteral) String

func (r *RegexLiteral) String() string

String returns a string representation of the literal.

type Result

type Result struct {
	// StatementID is just the statement's position in the query. It's used
	// to combine statement results if they're being buffered in memory.
	StatementID int
	Series      models.Rows
	Messages    []*Message
	Partial     bool
	Err         error
}

Result represents a resultset returned from a single statement. Rows represents a list of rows that can be sorted consistently by name/tag.

func (*Result) MarshalJSON

func (r *Result) MarshalJSON() ([]byte, error)

MarshalJSON encodes the result into JSON.

func (*Result) UnmarshalJSON

func (r *Result) UnmarshalJSON(b []byte) error

UnmarshalJSON decodes the data into the Result struct

type RevokeAdminStatement added in v0.9.2

type RevokeAdminStatement struct {
	// Who to revoke admin privilege from.
	User string
}

RevokeAdminStatement represents a command to revoke admin privilege from a user.

func (*RevokeAdminStatement) RequiredPrivileges added in v0.9.2

func (s *RevokeAdminStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a RevokeAdminStatement.

func (*RevokeAdminStatement) String added in v0.9.2

func (s *RevokeAdminStatement) String() string

String returns a string representation of the revoke admin statement.

type RevokeStatement

type RevokeStatement struct {
	// The privilege to be revoked.
	Privilege Privilege

	// Database to revoke the privilege from.
	On string

	// Who to revoke privilege from.
	User string
}

RevokeStatement represents a command to revoke a privilege from a user.

func (*RevokeStatement) DefaultDatabase added in v1.1.5

func (s *RevokeStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*RevokeStatement) RequiredPrivileges

func (s *RevokeStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a RevokeStatement.

func (*RevokeStatement) String

func (s *RevokeStatement) String() string

String returns a string representation of the revoke statement.

type Rewriter

type Rewriter interface {
	Rewrite(Node) Node
}

Rewriter can be called by Rewrite to replace nodes in the AST hierarchy. The Rewrite() function is called once per node.

type Scanner

type Scanner struct {
	// contains filtered or unexported fields
}

Scanner represents a lexical scanner for InfluxQL.

func NewScanner

func NewScanner(r io.Reader) *Scanner

NewScanner returns a new instance of Scanner.

func (*Scanner) Scan

func (s *Scanner) Scan() (tok Token, pos Pos, lit string)

Scan returns the next token and position from the underlying reader. Also returns the literal text read for strings, numbers, and duration tokens since these token types can have different literal representations.

func (*Scanner) ScanRegex

func (s *Scanner) ScanRegex() (tok Token, pos Pos, lit string)

ScanRegex consumes a token to find escapes

type SelectOptions added in v0.11.0

type SelectOptions struct {
	// Authorizer is used to limit access to data
	Authorizer Authorizer

	// The lower bound for a select call.
	MinTime time.Time

	// The upper bound for a select call.
	MaxTime time.Time

	// Node to exclusively read from.
	// If zero, all nodes are used.
	NodeID uint64

	// An optional channel that, if closed, signals that the select should be
	// interrupted.
	InterruptCh <-chan struct{}

	// Maximum number of concurrent series.
	MaxSeriesN int
}

SelectOptions are options that customize the select call.

type SelectStatement

type SelectStatement struct {
	// Expressions returned from the selection.
	Fields Fields

	// Target (destination) for the result of a SELECT INTO query.
	Target *Target

	// Expressions used for grouping the selection.
	Dimensions Dimensions

	// Data sources (measurements) that fields are extracted from.
	Sources Sources

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by.
	SortFields SortFields

	// Maximum number of rows to be returned. Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int

	// Maxiumum number of series to be returned. Unlimited if zero.
	SLimit int

	// Returns series starting at an offset from the first one.
	SOffset int

	// Whether it's a query for raw data values (i.e. not an aggregate).
	IsRawQuery bool

	// What fill option the select statement uses, if any.
	Fill FillOption

	// The value to fill empty aggregate buckets with, if any.
	FillValue interface{}

	// The timezone for the query, if any.
	Location *time.Location

	// Renames the implicit time field name.
	TimeAlias string

	// Removes the "time" column from the output.
	OmitTime bool

	// Removes duplicate rows from raw queries.
	Dedupe bool
	// contains filtered or unexported fields
}

SelectStatement represents a command for extracting data from the database.

func (*SelectStatement) Clone

func (s *SelectStatement) Clone() *SelectStatement

Clone returns a deep copy of the statement.

func (*SelectStatement) ColumnNames added in v0.9.4

func (s *SelectStatement) ColumnNames() []string

ColumnNames will walk all fields and functions and return the appropriate field names for the select statement while maintaining order of the field names.

func (*SelectStatement) FieldExprByName added in v1.2.0

func (s *SelectStatement) FieldExprByName(name string) (int, Expr)

FieldExprByName returns the expression that matches the field name and the index where this was found. If the name matches one of the arguments to "top" or "bottom", the variable reference inside of the function is returned and the index is of the function call rather than the variable reference. If no expression is found, -1 is returned for the index and the expression will be nil.

func (*SelectStatement) FunctionCalls

func (s *SelectStatement) FunctionCalls() []*Call

FunctionCalls returns the Call objects from the query.

func (*SelectStatement) FunctionCallsByPosition added in v0.9.5

func (s *SelectStatement) FunctionCallsByPosition() [][]*Call

FunctionCallsByPosition returns the Call objects from the query in the order they appear in the select statement.

func (*SelectStatement) GroupByInterval

func (s *SelectStatement) GroupByInterval() (time.Duration, error)

GroupByInterval extracts the time interval, if specified.

func (*SelectStatement) GroupByOffset added in v0.13.0

func (s *SelectStatement) GroupByOffset() (time.Duration, error)

GroupByOffset extracts the time interval offset, if specified.

func (*SelectStatement) HasDerivative

func (s *SelectStatement) HasDerivative() bool

HasDerivative returns true if any function call in the statement is a derivative aggregate.

func (*SelectStatement) HasDimensionWildcard added in v0.9.3

func (s *SelectStatement) HasDimensionWildcard() bool

HasDimensionWildcard returns whether or not the select statement has at least 1 wildcard in the dimensions aka `GROUP BY`.

func (*SelectStatement) HasDistinct

func (s *SelectStatement) HasDistinct() bool

HasDistinct checks if a select statement contains a call to DISTINCT.

func (*SelectStatement) HasFieldWildcard added in v0.9.3

func (s *SelectStatement) HasFieldWildcard() (hasWildcard bool)

HasFieldWildcard returns whether or not the select statement has at least 1 wildcard in the fields.

func (*SelectStatement) HasSelector added in v1.2.0

func (s *SelectStatement) HasSelector() bool

HasSelector returns true if there is exactly one selector.

func (*SelectStatement) HasTimeFieldSpecified added in v0.9.4

func (s *SelectStatement) HasTimeFieldSpecified() bool

HasTimeFieldSpecified will walk all fields and determine if the user explicitly asked for time. This is needed to determine re-write behaviors for functions like TOP and BOTTOM.

func (*SelectStatement) HasWildcard

func (s *SelectStatement) HasWildcard() bool

HasWildcard returns whether or not the select statement has at least 1 wildcard.

func (*SelectStatement) IsSimpleDerivative

func (s *SelectStatement) IsSimpleDerivative() bool

IsSimpleDerivative return true if any function call is a derivative function with a variable ref as the first arg.

func (*SelectStatement) NamesInDimension added in v0.9.3

func (s *SelectStatement) NamesInDimension() []string

NamesInDimension returns the field and tag names (idents) in the group by clause.

func (*SelectStatement) NamesInSelect

func (s *SelectStatement) NamesInSelect() []string

NamesInSelect returns the field and tag names (idents) in the select clause.

func (*SelectStatement) NamesInWhere

func (s *SelectStatement) NamesInWhere() []string

NamesInWhere returns the field and tag names (idents) referenced in the where clause.

func (*SelectStatement) Reduce added in v1.2.0

func (s *SelectStatement) Reduce(valuer Valuer) *SelectStatement

Reduce calls the Reduce function on the different components of the SelectStatement to reduce the statement.

func (*SelectStatement) RequiredPrivileges

func (s *SelectStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute the SelectStatement. NOTE: Statement should be normalized first (database name(s) in Sources and Target should be populated). If the statement has not been normalized, an empty string will be returned for the database name and it is up to the caller to interpret that as the default database.

func (*SelectStatement) RewriteDistinct

func (s *SelectStatement) RewriteDistinct()

RewriteDistinct rewrites the expression to be a call for map/reduce to work correctly. This method assumes all validation has passed.

func (*SelectStatement) RewriteFields added in v1.0.0

func (s *SelectStatement) RewriteFields(m FieldMapper) (*SelectStatement, error)

RewriteFields returns the re-written form of the select statement. Any wildcard query fields are replaced with the supplied fields, and any wildcard GROUP BY fields are replaced with the supplied dimensions. Any fields with no type specifier are rewritten with the appropriate type.

func (*SelectStatement) RewriteRegexConditions added in v1.1.0

func (s *SelectStatement) RewriteRegexConditions()

RewriteRegexConditions rewrites regex conditions to make better use of the database index.

Conditions that can currently be simplified are:

- host =~ /^foo$/ becomes host = 'foo'
- host !~ /^foo$/ becomes host != 'foo'

Note: if the regex contains groups, character classes, repetition or similar, it's likely it won't be rewritten. In order to support rewriting regexes with these characters would be a lot more work.

func (*SelectStatement) RewriteTimeCondition added in v1.2.0

func (s *SelectStatement) RewriteTimeCondition(now time.Time) error

RewriteTimeCondition adds time constraints to aggregate queries.

func (*SelectStatement) RewriteTimeFields added in v0.11.0

func (s *SelectStatement) RewriteTimeFields()

RewriteTimeFields removes any "time" field references.

func (*SelectStatement) SetTimeRange

func (s *SelectStatement) SetTimeRange(start, end time.Time) error

SetTimeRange sets the start and end time of the select statement to [start, end). i.e. start inclusive, end exclusive. This is used commonly for continuous queries so the start and end are in buckets.

func (*SelectStatement) String

func (s *SelectStatement) String() string

String returns a string representation of the select statement.

func (*SelectStatement) TimeAscending added in v0.9.5

func (s *SelectStatement) TimeAscending() bool

TimeAscending returns true if the time field is sorted in chronological order.

func (*SelectStatement) TimeFieldName added in v0.13.0

func (s *SelectStatement) TimeFieldName() string

TimeFieldName returns the name of the time field.

type SetPasswordUserStatement

type SetPasswordUserStatement struct {
	// Plain-text password.
	Password string

	// Who to grant the privilege to.
	Name string
}

SetPasswordUserStatement represents a command for changing user password.

func (*SetPasswordUserStatement) RequiredPrivileges

func (s *SetPasswordUserStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a SetPasswordUserStatement.

func (*SetPasswordUserStatement) String

func (s *SetPasswordUserStatement) String() string

String returns a string representation of the set password statement.

type ShowContinuousQueriesStatement

type ShowContinuousQueriesStatement struct{}

ShowContinuousQueriesStatement represents a command for listing continuous queries.

func (*ShowContinuousQueriesStatement) RequiredPrivileges

func (s *ShowContinuousQueriesStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a ShowContinuousQueriesStatement.

func (*ShowContinuousQueriesStatement) String

String returns a string representation of the show continuous queries statement.

type ShowDatabasesStatement

type ShowDatabasesStatement struct{}

ShowDatabasesStatement represents a command for listing all databases in the cluster.

func (*ShowDatabasesStatement) RequiredPrivileges

func (s *ShowDatabasesStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a ShowDatabasesStatement.

func (*ShowDatabasesStatement) String

func (s *ShowDatabasesStatement) String() string

String returns a string representation of the show databases command.

type ShowDiagnosticsStatement

type ShowDiagnosticsStatement struct {
	// Module
	Module string
}

ShowDiagnosticsStatement represents a command for show node diagnostics.

func (*ShowDiagnosticsStatement) RequiredPrivileges

func (s *ShowDiagnosticsStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a ShowDiagnosticsStatement

func (*ShowDiagnosticsStatement) String

func (s *ShowDiagnosticsStatement) String() string

String returns a string representation of the ShowDiagnosticsStatement.

type ShowFieldKeysStatement

type ShowFieldKeysStatement struct {
	// Database to query. If blank, use the default database.
	// The database can also be specified per source in the Sources.
	Database string

	// Data sources that fields are extracted from.
	Sources Sources

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowFieldKeysStatement represents a command for listing field keys.

func (*ShowFieldKeysStatement) DefaultDatabase added in v1.1.5

func (s *ShowFieldKeysStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*ShowFieldKeysStatement) RequiredPrivileges

func (s *ShowFieldKeysStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege(s) required to execute a ShowFieldKeysStatement.

func (*ShowFieldKeysStatement) String

func (s *ShowFieldKeysStatement) String() string

String returns a string representation of the statement.

type ShowGrantsForUserStatement added in v0.9.1

type ShowGrantsForUserStatement struct {
	// Name of the user to display privileges.
	Name string
}

ShowGrantsForUserStatement represents a command for listing user privileges.

func (*ShowGrantsForUserStatement) RequiredPrivileges added in v0.9.1

func (s *ShowGrantsForUserStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a ShowGrantsForUserStatement

func (*ShowGrantsForUserStatement) String added in v0.9.1

func (s *ShowGrantsForUserStatement) String() string

String returns a string representation of the show grants for user.

type ShowMeasurementsStatement

type ShowMeasurementsStatement struct {
	// Database to query. If blank, use the default database.
	Database string

	// Measurement name or regex.
	Source Source

	// An expression evaluated on data point.
	Condition Expr

	// Fields to sort results by
	SortFields SortFields

	// Maximum number of rows to be returned.
	// Unlimited if zero.
	Limit int

	// Returns rows starting at an offset from the first row.
	Offset int
}

ShowMeasurementsStatement represents a command for listing measurements.

func (*ShowMeasurementsStatement) DefaultDatabase added in v1.1.5

func (s *ShowMeasurementsStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*ShowMeasurementsStatement) RequiredPrivileges

func (s *ShowMeasurementsStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege(s) required to execute a ShowMeasurementsStatement.

func (*ShowMeasurementsStatement) String

func (s *ShowMeasurementsStatement) String() string

String returns a string representation of the statement.

type ShowQueriesStatement added in v0.12.0

type ShowQueriesStatement struct{}

ShowQueriesStatement represents a command for listing all running queries.

func (*ShowQueriesStatement) RequiredPrivileges added in v0.12.0

func (s *ShowQueriesStatement) RequiredPrivileges() (ExecutionPrivileges, error)

RequiredPrivileges returns the privilege required to execute a ShowQueriesStatement.

func (*ShowQueriesStatement) String added in v0.12.0

func (s *ShowQueriesStatement) String() string

String returns a string representation of the show queries statement.

type ShowRetentionPoliciesStatement

type ShowRetentionPoliciesStatement struct {
	// Name of the database to list policies for.
	Database string
}

ShowRetentionPoliciesStatement represents a command for listing retention policies.

func (*ShowRetentionPoliciesStatement) DefaultDatabase added in v1.1.5

func (s *ShowRetentionPoliciesStatement) DefaultDatabase() string

DefaultDatabase returns the default database from the statement.

func (*ShowRetentionPoliciesStatement)