querychecker

Documentation

Overview

Package querychecker performs a semantic check on an AST produced by the queryparser package.

For the foreseeasble future, only SelectStatements are supported. The following clauses are checked sequentially, SelectClause FromClause WhereClause (optional) LimitClause (optional) ResultsOffsetClause (optional)

Index

• Constants
• Variables
• func Check(db ds.Database, s *queryparser.Statement) error
• func CompileIndexRanges(idxField *queryparser.Field, kind vdl.Kind, where *queryparser.WhereClause) *ds.IndexRanges
• func ContainsFieldOperand(f *queryparser.Field, expr *queryparser.Expression) bool
• func ContainsFunctionOperand(expr *queryparser.Expression) bool
• func ContainsKeyOperand(expr *queryparser.Expression) bool
• func ContainsValueFieldOperand(expr *queryparser.Expression) bool
• func IsExactField(f *queryparser.Field, o *queryparser.Operand) bool
• func IsExpr(o *queryparser.Operand) bool
• func IsField(o *queryparser.Operand) bool
• func IsFunction(o *queryparser.Operand) bool
• func IsKey(o *queryparser.Operand) bool
• func IsKeyField(f *queryparser.Field) bool
• func IsLogicalOperator(o *queryparser.BinaryOperator) bool
• func IsValueField(f *queryparser.Field) bool

Constants

const (
	MaxRangeLimit = ""
)

Variables

var (
	StringFieldRangeAll = ds.StringFieldRange{Start: "", Limit: MaxRangeLimit}
)

Functions

func Check

func Check(db ds.Database, s *queryparser.Statement) error

func CompileIndexRanges

func CompileIndexRanges(idxField *queryparser.Field, kind vdl.Kind, where *queryparser.WhereClause) *ds.IndexRanges

Compute a list of secondary index ranges to optionally be used by query's Table.Scan.

func ContainsFieldOperand

func ContainsFieldOperand(f *queryparser.Field, expr *queryparser.Expression) bool

func ContainsFunctionOperand

func ContainsFunctionOperand(expr *queryparser.Expression) bool

func ContainsKeyOperand

func ContainsKeyOperand(expr *queryparser.Expression) bool

func ContainsValueFieldOperand

func ContainsValueFieldOperand(expr *queryparser.Expression) bool

func IsExactField

func IsExactField(f *queryparser.Field, o *queryparser.Operand) bool

func IsExpr

func IsExpr(o *queryparser.Operand) bool

func IsField

func IsField(o *queryparser.Operand) bool

func IsFunction

func IsFunction(o *queryparser.Operand) bool

func IsKey

func IsKey(o *queryparser.Operand) bool

func IsKeyField

func IsKeyField(f *queryparser.Field) bool

func IsLogicalOperator

func IsLogicalOperator(o *queryparser.BinaryOperator) bool

func IsValueField

func IsValueField(f *queryparser.Field) bool