stmtctx

package
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 Go to latest Published: Aug 23, 2023 License: Apache-2.0 Imports: 23 Imported by: 0

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Index

Constants

View Source 
const (
	// WarnLevelError represents level "Error" for 'SHOW WARNINGS' syntax.
	WarnLevelError = "Error"
	// WarnLevelWarning represents level "Warning" for 'SHOW WARNINGS' syntax.
	WarnLevelWarning = "Warning"
	// WarnLevelNote represents level "Note" for 'SHOW WARNINGS' syntax.
	WarnLevelNote = "Note"
)
View Source 
const (
	// ReferenceCountIsFrozen indicates the current StmtCtx is resetting, it'll refuse all the access from other sessions.
	ReferenceCountIsFrozen int32 = -1
	// ReferenceCountNoReference indicates the current StmtCtx is not accessed by other sessions.
	ReferenceCountNoReference int32 = 0
)

Variables

This section is empty.

Functions

func AllocateTaskID 

func AllocateTaskID() uint64

AllocateTaskID allocates a new unique ID for a statement execution

Types

type CopTasksDetails 

type CopTasksDetails struct {
	NumCopTasks int

	AvgProcessTime    time.Duration
	P90ProcessTime    time.Duration
	MaxProcessAddress string
	MaxProcessTime    time.Duration

	AvgWaitTime    time.Duration
	P90WaitTime    time.Duration
	MaxWaitAddress string
	MaxWaitTime    time.Duration

	MaxBackoffTime    map[string]time.Duration
	MaxBackoffAddress map[string]string
	AvgBackoffTime    map[string]time.Duration
	P90BackoffTime    map[string]time.Duration
	TotBackoffTime    map[string]time.Duration
	TotBackoffTimes   map[string]int
}

CopTasksDetails collects some useful information of cop-tasks during execution.

func (*CopTasksDetails) ToZapFields 

func (d *CopTasksDetails) ToZapFields() (fields []zap.Field)

ToZapFields wraps the CopTasksDetails as zap.Fileds.

type ReferenceCount 

type ReferenceCount int32

ReferenceCount indicates the reference count of StmtCtx.

func (*ReferenceCount) Decrease 

func (rf *ReferenceCount) Decrease()

Decrease decreases the reference count.

func (*ReferenceCount) TryFreeze 

func (rf *ReferenceCount) TryFreeze() bool

TryFreeze tries to freeze the StmtCtx to frozen before resetting the old StmtCtx.

func (*ReferenceCount) TryIncrease 

func (rf *ReferenceCount) TryIncrease() bool

TryIncrease tries to increase the reference count. There is a small chance that TryIncrease returns true while TryFreeze and UnFreeze are invoked successfully during the execution of TryIncrease.

func (*ReferenceCount) UnFreeze 

func (rf *ReferenceCount) UnFreeze()

UnFreeze unfreeze the frozen StmtCtx thus the other session can access this StmtCtx.

type SQLWarn 

type SQLWarn struct {
	Level string
	Err   error
}

SQLWarn relates a sql warning and it's level.

func (*SQLWarn) MarshalJSON 

func (warn *SQLWarn) MarshalJSON() ([]byte, error)

MarshalJSON implements the Marshaler.MarshalJSON interface.

func (*SQLWarn) UnmarshalJSON 

func (warn *SQLWarn) UnmarshalJSON(data []byte) error

UnmarshalJSON implements the Unmarshaler.UnmarshalJSON interface.

type StatementContext 

type StatementContext struct {
	// Set the following variables before execution
	StmtHints

	// IsDDLJobInQueue is used to mark whether the DDL job is put into the queue.
	// If IsDDLJobInQueue is true, it means the DDL job is in the queue of storage, and it can be handled by the DDL worker.
	IsDDLJobInQueue               bool
	DDLJobID                      int64
	InInsertStmt                  bool
	InUpdateStmt                  bool
	InDeleteStmt                  bool
	InSelectStmt                  bool
	InLoadDataStmt                bool
	InExplainStmt                 bool
	InCreateOrAlterStmt           bool
	InSetSessionStatesStmt        bool
	InPreparedPlanBuilding        bool
	IgnoreTruncate                bool
	IgnoreZeroInDate              bool
	NoZeroDate                    bool
	DupKeyAsWarning               bool
	BadNullAsWarning              bool
	DividedByZeroAsWarning        bool
	TruncateAsWarning             bool
	OverflowAsWarning             bool
	ErrAutoincReadFailedAsWarning bool
	InShowWarning                 bool
	UseCache                      bool
	BatchCheck                    bool
	InNullRejectCheck             bool
	AllowInvalidDate              bool
	IgnoreNoPartition             bool
	IgnoreExplainIDSuffix         bool
	SkipUTF8Check                 bool
	SkipASCIICheck                bool
	SkipUTF8MB4Check              bool
	MultiSchemaInfo               *model.MultiSchemaInfo
	// If the select statement was like 'select * from t as of timestamp ...' or in a stale read transaction
	// or is affected by the tidb_read_staleness session variable, then the statement will be makred as isStaleness
	// in stmtCtx
	IsStaleness     bool
	InRestrictedSQL bool
	ViewDepth       int32

	// PrevAffectedRows is the affected-rows value(DDL is 0, DML is the number of affected rows).
	PrevAffectedRows int64
	// PrevLastInsertID is the last insert ID of previous statement.
	PrevLastInsertID uint64
	// LastInsertID is the auto-generated ID in the current statement.
	LastInsertID uint64
	// InsertID is the given insert ID of an auto_increment column.
	InsertID uint64

	BaseRowID int64
	MaxRowID  int64

	// Copied from SessionVars.TimeZone.
	TimeZone         *time.Location
	Priority         mysql.PriorityEnum
	NotFillCache     bool
	MemTracker       *memory.Tracker
	DiskTracker      *disk.Tracker
	IsTiFlash        atomic2.Bool
	RuntimeStatsColl *execdetails.RuntimeStatsColl
	TableIDs         []int64
	IndexNames       []string
	StmtType         string
	OriginalSQL      string

	// BindSQL used to construct the key for plan cache. It records the binding used by the stmt.
	// If the binding is not used by the stmt, the value is empty
	BindSQL string

	Tables    []TableEntry
	PointExec bool // for point update cached execution, Constant expression need to set "paramMarker"

	PessimisticLockWaited int32
	LockKeysDuration      int64
	LockKeysCount         int32
	LockTableIDs          map[int64]struct{} // table IDs need to be locked, empty for lock all tables
	TblInfo2UnionScan     map[*model.TableInfo]bool
	TaskID                uint64 // unique ID for an execution of a statement
	TaskMapBakTS          uint64 // counter for

	// Map to store all CTE storages of current SQL.
	// Will clean up at the end of the execution.
	CTEStorageMap interface{}

	// If the statement read from table cache, this flag is set.
	ReadFromTableCache bool

	// OptimInfo maps Plan.ID() to optimization information when generating Plan.
	OptimInfo map[int]string
	// InVerboseExplain indicates the statement is "explain format='verbose' ...".
	InVerboseExplain bool

	// EnableOptimizeTrace indicates whether enable optimizer trace by 'trace plan statement'
	EnableOptimizeTrace bool
	// OptimizeTracer indicates the tracer for optimize
	OptimizeTracer *tracing.OptimizeTracer
	// EnableOptimizerCETrace indicate if cardinality estimation internal process needs to be traced.
	// CE Trace is currently a submodule of the optimizer trace and is controlled by a separated option.
	EnableOptimizerCETrace bool
	OptimizerCETrace       []*tracing.CETraceRecord

	// WaitLockLeaseTime is the duration of cached table read lease expiration time.
	WaitLockLeaseTime time.Duration

	// KvExecCounter is created from SessionVars.StmtStats to count the number of SQL
	// executions of the kv layer during the current execution of the statement.
	// Its life cycle is limited to this execution, and a new KvExecCounter is
	// always created during each statement execution.
	KvExecCounter *stmtstats.KvExecCounter

	// WeakConsistency is true when read consistency is weak and in a read statement and not in a transaction.
	WeakConsistency bool

	StatsLoad struct {
		// Timeout to wait for sync-load
		Timeout time.Duration
		// NeededItems stores the columns/indices whose stats are needed for planner.
		NeededItems []model.TableItemID
		// ResultCh to receive stats loading results
		ResultCh chan StatsLoadResult
		// LoadStartTime is to record the load start time to calculate latency
		LoadStartTime time.Time
	}

	// SysdateIsNow indicates whether sysdate() is an alias of now() in this statement
	SysdateIsNow bool

	// RCCheckTS indicates the current read-consistency read select statement will use `RCCheckTS` path.
	RCCheckTS bool

	// IsSQLRegistered uses to indicate whether the SQL has been registered for TopSQL.
	IsSQLRegistered atomic2.Bool
	// IsSQLAndPlanRegistered uses to indicate whether the SQL and plan has been registered for TopSQL.
	IsSQLAndPlanRegistered atomic2.Bool
	// IsReadOnly uses to indicate whether the SQL is read-only.
	IsReadOnly bool
	// StatsLoadStatus records StatsLoadedStatus for the index/column which is used in query
	StatsLoadStatus map[model.TableItemID]string
	// IsSyncStatsFailed indicates whether any failure happened during sync stats
	IsSyncStatsFailed bool
	// UseDynamicPruneMode indicates whether use UseDynamicPruneMode in query stmt
	UseDynamicPruneMode bool
	// ColRefFromPlan mark the column ref used by assignment in update statement.
	ColRefFromUpdatePlan []int64

	// RangeFallback indicates that building complete ranges exceeds the memory limit so it falls back to less accurate ranges such as full range.
	RangeFallback bool

	// IsExplainAnalyzeDML is true if the statement is "explain analyze DML executors", before responding the explain
	// results to the client, the transaction should be committed first. See issue #37373 for more details.
	IsExplainAnalyzeDML bool

	// InHandleForeignKeyTrigger indicates currently are handling foreign key trigger.
	InHandleForeignKeyTrigger bool

	// ForeignKeyTriggerCtx is the contain information for foreign key cascade execution.
	ForeignKeyTriggerCtx struct {
		// The SavepointName is use to do rollback when handle foreign key cascade failed.
		SavepointName string
		HasFKCascades bool
	}

	// TableStats stores the visited runtime table stats by table id during query
	TableStats map[int64]interface{}

	// StaleTSOProvider is used to provide stale timestamp oracle for read-only transactions.
	StaleTSOProvider struct {
		sync.Mutex
		// contains filtered or unexported fields
	}
	// contains filtered or unexported fields
}

StatementContext contains variables for a statement. It should be reset before executing a statement.

func (*StatementContext) AddAffectedRows 

func (sc *StatementContext) AddAffectedRows(rows uint64)

AddAffectedRows adds affected rows.

func (*StatementContext) AddCopiedRows 

func (sc *StatementContext) AddCopiedRows(rows uint64)

AddCopiedRows adds copied rows.

func (*StatementContext) AddDeletedRows 

func (sc *StatementContext) AddDeletedRows(rows uint64)

AddDeletedRows adds record rows.

func (*StatementContext) AddFoundRows 

func (sc *StatementContext) AddFoundRows(rows uint64)

AddFoundRows adds found rows.

func (*StatementContext) AddRecordRows 

func (sc *StatementContext) AddRecordRows(rows uint64)

AddRecordRows adds record rows.

func (*StatementContext) AddTouchedRows 

func (sc *StatementContext) AddTouchedRows(rows uint64)

AddTouchedRows adds touched rows.

func (*StatementContext) AddUpdatedRows 

func (sc *StatementContext) AddUpdatedRows(rows uint64)

AddUpdatedRows adds updated rows.

func (*StatementContext) AffectedRows 

func (sc *StatementContext) AffectedRows() uint64

AffectedRows gets affected rows.

func (*StatementContext) AppendError 

func (sc *StatementContext) AppendError(warn error)

AppendError appends a warning with level 'Error'.

func (*StatementContext) AppendNote 

func (sc *StatementContext) AppendNote(warn error)

AppendNote appends a warning with level 'Note'.

func (*StatementContext) AppendWarning 

func (sc *StatementContext) AppendWarning(warn error)

AppendWarning appends a warning with level 'Warning'.

func (*StatementContext) AppendWarnings 

func (sc *StatementContext) AppendWarnings(warns []SQLWarn)

AppendWarnings appends some warnings.

func (*StatementContext) ClearUseChunkAlloc 

func (sc *StatementContext) ClearUseChunkAlloc()

ClearUseChunkAlloc clear useChunkAlloc status

func (*StatementContext) CopTasksDetails 

func (sc *StatementContext) CopTasksDetails() *CopTasksDetails

CopTasksDetails returns some useful information of cop-tasks during execution.

func (*StatementContext) CopiedRows 

func (sc *StatementContext) CopiedRows() uint64

CopiedRows is used to generate info message

func (*StatementContext) DeletedRows 

func (sc *StatementContext) DeletedRows() uint64

DeletedRows is used to generate info message

func (*StatementContext) DetachMemDiskTracker 

func (sc *StatementContext) DetachMemDiskTracker()

DetachMemDiskTracker detaches the memory and disk tracker from the sessionTracker.

func (*StatementContext) FoundRows 

func (sc *StatementContext) FoundRows() uint64

FoundRows gets found rows.

func (*StatementContext) GetBinaryPlan 

func (sc *StatementContext) GetBinaryPlan() string

GetBinaryPlan gets the binaryPlan field of stmtctx

func (*StatementContext) GetEncodedPlan 

func (sc *StatementContext) GetEncodedPlan() string

GetEncodedPlan gets the encoded plan, it is used to avoid repeated encode.

func (*StatementContext) GetExecDetails 

func (sc *StatementContext) GetExecDetails() execdetails.ExecDetails

GetExecDetails gets the execution details for the statement.

func (*StatementContext) GetFlatPlan 

func (sc *StatementContext) GetFlatPlan() interface{}

GetFlatPlan gets the flatPlan field of stmtctx

func (*StatementContext) GetLockWaitStartTime 

func (sc *StatementContext) GetLockWaitStartTime() time.Time

GetLockWaitStartTime returns the statement pessimistic lock wait start time

func (*StatementContext) GetMessage 

func (sc *StatementContext) GetMessage() string

GetMessage returns the extra message of the last executed command, if there is no message, it returns empty string

func (*StatementContext) GetOrEvaluateStmtCache 

func (sc *StatementContext) GetOrEvaluateStmtCache(key StmtCacheKey, valueEvaluator func() (interface{}, error)) (interface{}, error)

GetOrEvaluateStmtCache gets the cached value of the given key if it exists, otherwise calculate the value.

func (*StatementContext) GetOrStoreStmtCache 

func (sc *StatementContext) GetOrStoreStmtCache(key StmtCacheKey, value interface{}) interface{}

GetOrStoreStmtCache gets the cached value of the given key if it exists, otherwise stores the value.

func (*StatementContext) GetPlan 

func (sc *StatementContext) GetPlan() interface{}

GetPlan gets the plan field of stmtctx

func (*StatementContext) GetPlanDigest 

func (sc *StatementContext) GetPlanDigest() (normalized string, planDigest *parser.Digest)

GetPlanDigest gets the normalized plan and plan digest.

func (*StatementContext) GetPlanHint 

func (sc *StatementContext) GetPlanHint() (string, bool)

GetPlanHint gets the hint string generated from the plan.

func (*StatementContext) GetResourceGroupTagger 

func (sc *StatementContext) GetResourceGroupTagger() tikvrpc.ResourceGroupTagger

GetResourceGroupTagger returns the implementation of tikvrpc.ResourceGroupTagger related to self.

func (*StatementContext) GetStaleTSO 

func (sc *StatementContext) GetStaleTSO() (uint64, error)

GetStaleTSO returns the TSO for stale-read usage which calculate from PD's last response.

func (*StatementContext) GetUseChunkAllocStatus 

func (sc *StatementContext) GetUseChunkAllocStatus() bool

GetUseChunkAllocStatus returns useChunkAlloc status

func (*StatementContext) GetWarnings 

func (sc *StatementContext) GetWarnings() []SQLWarn

GetWarnings gets warnings.

func (*StatementContext) HandleOverflow 

func (sc *StatementContext) HandleOverflow(err error, warnErr error) error

HandleOverflow treats ErrOverflow as warnings or returns the error based on the StmtCtx.OverflowAsWarning state.

func (*StatementContext) HandleTruncate 

func (sc *StatementContext) HandleTruncate(err error) error

HandleTruncate ignores or returns the error based on the StatementContext state.

func (*StatementContext) InitDiskTracker 

func (sc *StatementContext) InitDiskTracker(label int, bytesLimit int64)

InitDiskTracker initializes the sc.DiskTracker, use cache to avoid allocation.

func (*StatementContext) InitMemTracker 

func (sc *StatementContext) InitMemTracker(label int, bytesLimit int64)

InitMemTracker initializes the sc.MemTracker, use cache to avoid allocation.

func (*StatementContext) InitSQLDigest 

func (sc *StatementContext) InitSQLDigest(normalized string, digest *parser.Digest)

InitSQLDigest sets the normalized and digest for sql.

func (*StatementContext) MergeExecDetails 

func (sc *StatementContext) MergeExecDetails(details *execdetails.ExecDetails, commitDetails *util.CommitDetails)

MergeExecDetails merges a single region execution details into self, used to print the information in slow query log.

func (*StatementContext) MergeLockKeysExecDetails 

func (sc *StatementContext) MergeLockKeysExecDetails(lockKeys *util.LockKeysDetails)

MergeLockKeysExecDetails merges lock keys execution details into self.

func (*StatementContext) MergeScanDetail 

func (sc *StatementContext) MergeScanDetail(scanDetail *util.ScanDetail)

MergeScanDetail merges scan details into self.

func (*StatementContext) MergeTimeDetail 

func (sc *StatementContext) MergeTimeDetail(timeDetail util.TimeDetail)

MergeTimeDetail merges time details into self.

func (*StatementContext) NumErrorWarnings 

func (sc *StatementContext) NumErrorWarnings() (ec uint16, wc int)

NumErrorWarnings gets warning and error count.

func (*StatementContext) PushDownFlags 

func (sc *StatementContext) PushDownFlags() uint64

PushDownFlags converts StatementContext to tipb.SelectRequest.Flags.

func (*StatementContext) RecordRangeFallback 

func (sc *StatementContext) RecordRangeFallback(rangeMaxSize int64)

RecordRangeFallback records range fallback.

func (*StatementContext) RecordRows 

func (sc *StatementContext) RecordRows() uint64

RecordRows is used to generate info message

func (*StatementContext) ResetForRetry 

func (sc *StatementContext) ResetForRetry()

ResetForRetry resets the changed states during execution.

func (*StatementContext) ResetInStmtCache 

func (sc *StatementContext) ResetInStmtCache(key StmtCacheKey)

ResetInStmtCache resets the cache of given key.

func (*StatementContext) ResetSQLDigest 

func (sc *StatementContext) ResetSQLDigest(s string)

ResetSQLDigest sets the normalized and digest for sql anyway, **DO NOT USE THIS UNLESS YOU KNOW WHAT YOU ARE DOING NOW**.

func (*StatementContext) ResetStmtCache 

func (sc *StatementContext) ResetStmtCache()

ResetStmtCache resets all cached values.

func (*StatementContext) SQLDigest 

func (sc *StatementContext) SQLDigest() (normalized string, sqlDigest *parser.Digest)

SQLDigest gets normalized and digest for provided sql. it will cache result after first calling.

func (*StatementContext) SetAffectedRows 

func (sc *StatementContext) SetAffectedRows(rows uint64)

SetAffectedRows sets affected rows.

func (*StatementContext) SetBinaryPlan 

func (sc *StatementContext) SetBinaryPlan(binaryPlan string)

SetBinaryPlan sets the binaryPlan field of stmtctx

func (*StatementContext) SetEncodedPlan 

func (sc *StatementContext) SetEncodedPlan(encodedPlan string)

SetEncodedPlan sets the encoded plan, it is used to avoid repeated encode.

func (*StatementContext) SetFlagsFromPBFlag 

func (sc *StatementContext) SetFlagsFromPBFlag(flags uint64)

SetFlagsFromPBFlag set the flag of StatementContext from a `tipb.SelectRequest.Flags`.

func (*StatementContext) SetFlatPlan 

func (sc *StatementContext) SetFlatPlan(flat interface{})

SetFlatPlan sets the flatPlan field of stmtctx

func (*StatementContext) SetMessage 

func (sc *StatementContext) SetMessage(msg string)

SetMessage sets the info message generated by some commands

func (*StatementContext) SetPlan 

func (sc *StatementContext) SetPlan(plan interface{})

SetPlan sets the plan field of stmtctx

func (*StatementContext) SetPlanDigest 

func (sc *StatementContext) SetPlanDigest(normalized string, planDigest *parser.Digest)

SetPlanDigest sets the normalized plan and plan digest.

func (*StatementContext) SetPlanHint 

func (sc *StatementContext) SetPlanHint(hint string)

SetPlanHint sets the hint for the plan.

func (*StatementContext) SetSkipPlanCache 

func (sc *StatementContext) SetSkipPlanCache(reason error)

SetSkipPlanCache sets to skip the plan cache and records the reason.

func (*StatementContext) SetStaleTSOProvider 

func (sc *StatementContext) SetStaleTSOProvider(eval func() (uint64, error))

SetStaleTSOProvider sets the stale TSO provider.

func (*StatementContext) SetUseChunkAlloc 

func (sc *StatementContext) SetUseChunkAlloc()

SetUseChunkAlloc set use chunk alloc status

func (*StatementContext) SetWarnings 

func (sc *StatementContext) SetWarnings(warns []SQLWarn)

SetWarnings sets warnings.

func (*StatementContext) ShouldClipToZero 

func (sc *StatementContext) ShouldClipToZero() bool

ShouldClipToZero indicates whether values less than 0 should be clipped to 0 for unsigned integer types. This is the case for `insert`, `update`, `alter table`, `create table` and `load data infile` statements, when not in strict SQL mode. see https://dev.mysql.com/doc/refman/5.7/en/out-of-range-and-overflow.html

func (*StatementContext) ShouldIgnoreOverflowError 

func (sc *StatementContext) ShouldIgnoreOverflowError() bool

ShouldIgnoreOverflowError indicates whether we should ignore the error when type conversion overflows, so we can leave it for further processing like clipping values less than 0 to 0 for unsigned integer types.

func (*StatementContext) TouchedRows 

func (sc *StatementContext) TouchedRows() uint64

TouchedRows is used to generate info message

func (*StatementContext) TruncateWarnings 

func (sc *StatementContext) TruncateWarnings(start int) []SQLWarn

TruncateWarnings truncates warnings begin from start and returns the truncated warnings.

func (*StatementContext) UpdatedRows 

func (sc *StatementContext) UpdatedRows() uint64

UpdatedRows is used to generate info message

func (*StatementContext) UseDynamicPartitionPrune 

func (sc *StatementContext) UseDynamicPartitionPrune() bool

UseDynamicPartitionPrune indicates whether dynamic partition is used during the query

func (*StatementContext) WarningCount 

func (sc *StatementContext) WarningCount() uint16

WarningCount gets warning count.

type StatsLoadResult 

type StatsLoadResult struct {
	Item  model.TableItemID
	Error error
}

StatsLoadResult indicates result for StatsLoad

func (StatsLoadResult) ErrorMsg 

func (r StatsLoadResult) ErrorMsg() string

ErrorMsg returns StatsLoadResult err msg

func (StatsLoadResult) HasError 

func (r StatsLoadResult) HasError() bool

HasError returns whether result has error

type StmtCacheKey 

type StmtCacheKey int

StmtCacheKey represents the key type in the StmtCache. 

const (
	// StmtNowTsCacheKey is a variable for now/current_timestamp calculation/cache of one stmt.
	StmtNowTsCacheKey StmtCacheKey = iota
	// StmtSafeTSCacheKey is a variable for safeTS calculation/cache of one stmt.
	StmtSafeTSCacheKey
	// StmtExternalTSCacheKey is a variable for externalTS calculation/cache of one stmt.
	StmtExternalTSCacheKey
)

type StmtHints 

type StmtHints struct {
	// Hint Information
	MemQuotaQuery           int64
	MaxExecutionTime        uint64
	ReplicaRead             byte
	AllowInSubqToJoinAndAgg bool
	NoIndexMergeHint        bool
	StraightJoinOrder       bool
	// EnableCascadesPlanner is use cascades planner for a single query only.
	EnableCascadesPlanner bool
	// ForceNthPlan indicates the PlanCounterTp number for finding physical plan.
	// -1 for disable.
	ForceNthPlan int64

	// Hint flags
	HasAllowInSubqToJoinAndAggHint bool
	HasMemQuotaHint                bool
	HasReplicaReadHint             bool
	HasMaxExecutionTime            bool
	HasEnableCascadesPlannerHint   bool
	SetVars                        map[string]string

	// the original table hints
	OriginalTableHints []*ast.TableOptimizerHint
}

StmtHints are SessionVars related sql hints.

func (*StmtHints) Clone 

func (sh *StmtHints) Clone() *StmtHints

Clone the StmtHints struct and returns the pointer of the new one.

func (*StmtHints) TaskMapNeedBackUp 

func (sh *StmtHints) TaskMapNeedBackUp() bool

TaskMapNeedBackUp indicates that whether we need to back up taskMap during physical optimizing.

type TableEntry 

type TableEntry struct {
	DB    string
	Table string
}

TableEntry presents table in db.

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