plan

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 Go to latest Published: Sep 14, 2018 License: Apache-2.0 Imports: 44 Imported by: 0

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Index

Constants

View Source 
const (
	// TypeSel is the type of Selection.
	TypeSel = "Selection"
	// TypeSet is the type of Set.
	TypeSet = "Set"
	// TypeProj is the type of Projection.
	TypeProj = "Projection"
	// TypeAgg is the type of Aggregation.
	TypeAgg = "Aggregation"
	// TypeStreamAgg is the type of StreamAgg.
	TypeStreamAgg = "StreamAgg"
	// TypeHashAgg is the type of HashAgg.
	TypeHashAgg = "HashAgg"
	// TypeShow is the type of show.
	TypeShow = "Show"
	// TypeJoin is the type of Join.
	TypeJoin = "Join"
	// TypeUnion is the type of Union.
	TypeUnion = "Union"
	// TypeTableScan is the type of TableScan.
	TypeTableScan = "TableScan"
	// TypeMemTableScan is the type of TableScan.
	TypeMemTableScan = "MemTableScan"
	// TypeUnionScan is the type of UnionScan.
	TypeUnionScan = "UnionScan"
	// TypeIdxScan is the type of IndexScan.
	TypeIdxScan = "IndexScan"
	// TypeSort is the type of Sort.
	TypeSort = "Sort"
	// TypeTopN is the type of TopN.
	TypeTopN = "TopN"
	// TypeLimit is the type of Limit.
	TypeLimit = "Limit"
	// TypeHashLeftJoin is the type of left hash join.
	TypeHashLeftJoin = "HashLeftJoin"
	// TypeHashRightJoin is the type of right hash join.
	TypeHashRightJoin = "HashRightJoin"
	// TypeMergeJoin is the type of merge join.
	TypeMergeJoin = "MergeJoin"
	// TypeIndexJoin is the type of index look up join.
	TypeIndexJoin = "IndexJoin"
	// TypeApply is the type of Apply.
	TypeApply = "Apply"
	// TypeMaxOneRow is the type of MaxOneRow.
	TypeMaxOneRow = "MaxOneRow"
	// TypeExists is the type of Exists.
	TypeExists = "Exists"
	// TypeDual is the type of TableDual.
	TypeDual = "TableDual"
	// TypeLock is the type of SelectLock.
	TypeLock = "SelectLock"
	// TypeInsert is the type of Insert
	TypeInsert = "Insert"
	// TypeUpdate is the type of Update.
	TypeUpdate = "Update"
	// TypeDelete is the type of Delete.
	TypeDelete = "Delete"
	// TypeIndexLookUp is the type of IndexLookUp.
	TypeIndexLookUp = "IndexLookUp"
	// TypeTableReader is the type of TableReader.
	TypeTableReader = "TableReader"
	// TypeIndexReader is the type of IndexReader.
	TypeIndexReader = "IndexReader"
)
View Source 
const (
	// TiDBMergeJoin is hint enforce merge join.
	TiDBMergeJoin = "tidb_smj"
	// TiDBIndexNestedLoopJoin is hint enforce index nested loop join.
	TiDBIndexNestedLoopJoin = "tidb_inlj"
	// TiDBHashJoin is hint enforce hash join.
	TiDBHashJoin = "tidb_hj"
)
View Source 
const (
	// ErrExprInSelect  is in select fields for the error of ErrFieldNotInGroupBy
	ErrExprInSelect = "SELECT list"
	// ErrExprInOrderBy  is in order by items for the error of ErrFieldNotInGroupBy
	ErrExprInOrderBy = "ORDER BY"
)

Variables

View Source 
var (
	ErrUnsupportedType             = terror.ClassOptimizer.New(codeUnsupportedType, "Unsupported type %T")
	ErrAnalyzeMissIndex            = terror.ClassOptimizer.New(codeAnalyzeMissIndex, "Index '%s' in field list does not exist in table '%s'")
	ErrCartesianProductUnsupported = terror.ClassOptimizer.New(codeUnsupported, "Cartesian product is unsupported")
	ErrStmtNotFound                = terror.ClassOptimizer.New(codeStmtNotFound, "Prepared statement not found")
	ErrWrongParamCount             = terror.ClassOptimizer.New(codeWrongParamCount, "Wrong parameter count")
	ErrSchemaChanged               = terror.ClassOptimizer.New(codeSchemaChanged, "Schema has changed")

	ErrWrongUsage                   = terror.ClassOptimizer.New(codeWrongUsage, mysql.MySQLErrName[mysql.ErrWrongUsage])
	ErrAmbiguous                    = terror.ClassOptimizer.New(codeAmbiguous, mysql.MySQLErrName[mysql.ErrNonUniq])
	ErrUnknownColumn                = terror.ClassOptimizer.New(codeUnknownColumn, mysql.MySQLErrName[mysql.ErrBadField])
	ErrUnknownTable                 = terror.ClassOptimizer.New(codeUnknownTable, mysql.MySQLErrName[mysql.ErrUnknownTable])
	ErrWrongArguments               = terror.ClassOptimizer.New(codeWrongArguments, mysql.MySQLErrName[mysql.ErrWrongArguments])
	ErrWrongNumberOfColumnsInSelect = terror.ClassOptimizer.New(codeWrongNumberOfColumnsInSelect, mysql.MySQLErrName[mysql.ErrWrongNumberOfColumnsInSelect])
	ErrBadGeneratedColumn           = terror.ClassOptimizer.New(codeBadGeneratedColumn, mysql.MySQLErrName[mysql.ErrBadGeneratedColumn])
	ErrFieldNotInGroupBy            = terror.ClassOptimizer.New(codeFieldNotInGroupBy, mysql.MySQLErrName[mysql.ErrFieldNotInGroupBy])
	ErrBadTable                     = terror.ClassOptimizer.New(codeBadTable, mysql.MySQLErrName[mysql.ErrBadTable])
	ErrKeyDoesNotExist              = terror.ClassOptimizer.New(codeKeyDoesNotExist, mysql.MySQLErrName[mysql.ErrKeyDoesNotExist])
	ErrOperandColumns               = terror.ClassOptimizer.New(codeOperandColumns, mysql.MySQLErrName[mysql.ErrOperandColumns])
	ErrInvalidWildCard              = terror.ClassOptimizer.New(codeInvalidWildCard, "Wildcard fields without any table name appears in wrong place")
	ErrInvalidGroupFuncUse          = terror.ClassOptimizer.New(codeInvalidGroupFuncUse, mysql.MySQLErrName[mysql.ErrInvalidGroupFuncUse])
	ErrIllegalReference             = terror.ClassOptimizer.New(codeIllegalReference, mysql.MySQLErrName[mysql.ErrIllegalReference])
	ErrNoDB                         = terror.ClassOptimizer.New(codeNoDB, mysql.MySQLErrName[mysql.ErrNoDB])
	ErrUnknownExplainFormat         = terror.ClassOptimizer.New(codeUnknownExplainFormat, mysql.MySQLErrName[mysql.ErrUnknownExplainFormat])
	ErrWrongGroupField              = terror.ClassOptimizer.New(codeWrongGroupField, mysql.MySQLErrName[mysql.ErrWrongGroupField])
	ErrDupFieldName                 = terror.ClassOptimizer.New(codeDupFieldName, mysql.MySQLErrName[mysql.ErrDupFieldName])
	ErrNonUpdatableTable            = terror.ClassOptimizer.New(codeNonUpdatableTable, mysql.MySQLErrName[mysql.ErrNonUpdatableTable])
	ErrInternal                     = terror.ClassOptimizer.New(codeInternal, mysql.MySQLErrName[mysql.ErrInternal])
	ErrMixOfGroupFuncAndFields      = terror.ClassOptimizer.New(codeMixOfGroupFuncAndFields, "In aggregated query without GROUP BY, expression #%d of SELECT list contains nonaggregated column '%s'; this is incompatible with sql_mode=only_full_group_by")
	ErrNonUniqTable                 = terror.ClassOptimizer.New(codeNonUniqTable, mysql.MySQLErrName[mysql.ErrNonuniqTable])
	ErrWrongValueCountOnRow         = terror.ClassOptimizer.New(mysql.ErrWrongValueCountOnRow, mysql.MySQLErrName[mysql.ErrWrongValueCountOnRow])
)

error definitions.

View Source 
var AllowCartesianProduct = true

AllowCartesianProduct means whether tidb allows cartesian join without equal conditions.

View Source 
var EvalSubquery func(p PhysicalPlan, is infoschema.InfoSchema, ctx sessionctx.Context) ([][]types.Datum, error)

EvalSubquery evaluates incorrelated subqueries once.

View Source 
var (

	// PreparedPlanCacheCapacity stores the global config "prepared-plan-cache-capacity".
	PreparedPlanCacheCapacity uint
)

Functions

func Cacheable 

func Cacheable(node ast.Node) bool

Cacheable checks whether the input ast is cacheable.

func NewPSTMTPlanCacheKey 

func NewPSTMTPlanCacheKey(sessionVars *variable.SessionVars, pstmtID uint32, schemaVersion int64) kvcache.Key

NewPSTMTPlanCacheKey creates a new pstmtPlanCacheKey object.

func PreparedPlanCacheEnabled 

func PreparedPlanCacheEnabled() bool

PreparedPlanCacheEnabled returns whether the prepared plan cache is enabled.

func Preprocess 

func Preprocess(ctx sessionctx.Context, node ast.Node, is infoschema.InfoSchema, inPrepare bool) error

Preprocess resolves table names of the node, and checks some statements validation.

func SetPBColumnsDefaultValue 

func SetPBColumnsDefaultValue(ctx sessionctx.Context, pbColumns []*tipb.ColumnInfo, columns []*model.ColumnInfo) error

SetPBColumnsDefaultValue sets the default values of tipb.ColumnInfos.

func SetPreparedPlanCache 

func SetPreparedPlanCache(isEnabled bool)

SetPreparedPlanCache sets isEnabled to true, then prepared plan cache is enabled.

func SupportStreaming 

func SupportStreaming(p PhysicalPlan) bool

SupportStreaming returns true if a pushed down operation supports using coprocessor streaming API. Note that this function handle pushed down physical plan only! It's called in constructDAGReq. Some plans are difficult (if possible) to implement streaming, and some are pointless to do so. TODO: Support more kinds of physical plan.

func ToString 

func ToString(p Plan) string

ToString explains a Plan, returns description string.

Types

type AggregateFuncExtractor 

type AggregateFuncExtractor struct {

	// AggFuncs is the collected AggregateFuncExprs.
	AggFuncs []*ast.AggregateFuncExpr
	// contains filtered or unexported fields
}

AggregateFuncExtractor visits Expr tree. It converts ColunmNameExpr to AggregateFuncExpr and collects AggregateFuncExpr.

func (*AggregateFuncExtractor) Enter 

func (a *AggregateFuncExtractor) Enter(n ast.Node) (ast.Node, bool)

Enter implements Visitor interface.

func (*AggregateFuncExtractor) Leave 

func (a *AggregateFuncExtractor) Leave(n ast.Node) (ast.Node, bool)

Leave implements Visitor interface.

type AggregationType 

type AggregationType int

AggregationType stands for the mode of aggregation plan. 

const (
	// StreamedAgg supposes its input is sorted by group by key.
	StreamedAgg AggregationType = iota
	// FinalAgg supposes its input is partial results.
	FinalAgg
	// CompleteAgg supposes its input is original results.
	CompleteAgg
)

func (AggregationType) String 

func (at AggregationType) String() string

String implements fmt.Stringer interface.

type Analyze 

type Analyze struct {
	ColTasks      []AnalyzeColumnsTask
	IdxTasks      []AnalyzeIndexTask
	MaxNumBuckets uint64
	// contains filtered or unexported fields
}

Analyze represents an analyze plan

func (*Analyze) ResolveIndices 

func (p *Analyze) ResolveIndices()

func (*Analyze) Schema 

func (s *Analyze) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Analyze) SetSchema 

func (s *Analyze) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type AnalyzeColumnsTask 

type AnalyzeColumnsTask struct {
	PhysicalTableID int64
	PKInfo          *model.ColumnInfo
	ColsInfo        []*model.ColumnInfo
}

AnalyzeColumnsTask is used for analyze columns.

type AnalyzeIndexTask 

type AnalyzeIndexTask struct {
	// PhysicalTableID is the id for a partition or a table.
	PhysicalTableID int64
	IndexInfo       *model.IndexInfo
}

AnalyzeIndexTask is used for analyze index.

type ByItems 

type ByItems struct {
	Expr expression.Expression
	Desc bool
}

ByItems wraps a "by" item.

func (*ByItems) Clone 

func (by *ByItems) Clone() *ByItems

Clone makes a copy of ByItems.

func (*ByItems) String 

func (by *ByItems) String() string

String implements fmt.Stringer interface.

type CancelDDLJobs added in v1.0.1 

type CancelDDLJobs struct {
	JobIDs []int64
	// contains filtered or unexported fields
}

CancelDDLJobs represents a cancel DDL jobs plan.

func (*CancelDDLJobs) ResolveIndices added in v1.0.1 

func (p *CancelDDLJobs) ResolveIndices()

func (*CancelDDLJobs) Schema added in v1.0.1 

func (s *CancelDDLJobs) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*CancelDDLJobs) SetSchema added in v1.0.1 

func (s *CancelDDLJobs) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type CheckIndex 

type CheckIndex struct {
	IndexLookUpReader *PhysicalIndexLookUpReader
	DBName            string
	IdxName           string
	// contains filtered or unexported fields
}

CheckIndex is used for checking index data, built from the 'admin check index' statement.

func (*CheckIndex) ResolveIndices 

func (p *CheckIndex) ResolveIndices()

func (*CheckIndex) Schema 

func (s *CheckIndex) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*CheckIndex) SetSchema 

func (s *CheckIndex) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type CheckIndexRange 

type CheckIndexRange struct {
	Table     *ast.TableName
	IndexName string

	HandleRanges []ast.HandleRange
	// contains filtered or unexported fields
}

CheckIndexRange is used for checking index data, output the index values that handle within begin and end.

func (*CheckIndexRange) ResolveIndices 

func (p *CheckIndexRange) ResolveIndices()

func (*CheckIndexRange) Schema 

func (s *CheckIndexRange) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*CheckIndexRange) SetSchema 

func (s *CheckIndexRange) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type CheckTable 

type CheckTable struct {
	Tables []*ast.TableName

	GenExprs map[string]expression.Expression
	// contains filtered or unexported fields
}

CheckTable is used for checking table data, built from the 'admin check table' statement.

func (*CheckTable) ResolveIndices 

func (p *CheckTable) ResolveIndices()

func (*CheckTable) Schema 

func (s *CheckTable) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*CheckTable) SetSchema 

func (s *CheckTable) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type ChecksumTable 

type ChecksumTable struct {
	Tables []*ast.TableName
	// contains filtered or unexported fields
}

ChecksumTable is used for calculating table checksum, built from the `admin checksum table` statement.

func (*ChecksumTable) ResolveIndices 

func (p *ChecksumTable) ResolveIndices()

func (*ChecksumTable) Schema 

func (s *ChecksumTable) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*ChecksumTable) SetSchema 

func (s *ChecksumTable) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type CleanupIndex 

type CleanupIndex struct {
	Table     *ast.TableName
	IndexName string
	// contains filtered or unexported fields
}

CleanupIndex is used to delete dangling index data.

func (*CleanupIndex) ResolveIndices 

func (p *CleanupIndex) ResolveIndices()

func (*CleanupIndex) Schema 

func (s *CleanupIndex) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*CleanupIndex) SetSchema 

func (s *CleanupIndex) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type DDL 

type DDL struct {
	Statement ast.DDLNode
	// contains filtered or unexported fields
}

DDL represents a DDL statement plan.

func (*DDL) ResolveIndices 

func (p *DDL) ResolveIndices()

func (*DDL) Schema 

func (s *DDL) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*DDL) SetSchema 

func (s *DDL) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type DataSource 

type DataSource struct {
	Columns []*model.ColumnInfo
	DBName  model.CIStr

	TableAsName *model.CIStr

	LimitCount *int64
	// contains filtered or unexported fields
}

DataSource represents a tablescan without condition push down.

func (*DataSource) PredicatePushDown 

func (ds *DataSource) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*DataSource) PruneColumns 

func (ds *DataSource) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*DataSource) Schema 

func (s *DataSource) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*DataSource) SetSchema 

func (s *DataSource) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

func (*DataSource) TableInfo 

func (ds *DataSource) TableInfo() *model.TableInfo

TableInfo returns the *TableInfo of data source.

type Deallocate 

type Deallocate struct {
	Name string
	// contains filtered or unexported fields
}

Deallocate represents deallocate plan.

func (*Deallocate) ResolveIndices 

func (p *Deallocate) ResolveIndices()

func (*Deallocate) Schema 

func (s *Deallocate) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Deallocate) SetSchema 

func (s *Deallocate) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Delete 

type Delete struct {
	Tables       []*ast.TableName
	IsMultiTable bool

	SelectPlan PhysicalPlan
	// contains filtered or unexported fields
}

Delete represents a delete plan.

func (*Delete) ResolveIndices 

func (p *Delete) ResolveIndices()

func (*Delete) Schema 

func (s *Delete) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Delete) SetSchema 

func (s *Delete) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type ErrExprLoc 

type ErrExprLoc struct {
	Offset int
	Loc    string
}

ErrExprLoc is for generate the ErrFieldNotInGroupBy error info

type Execute 

type Execute struct {
	Name      string
	UsingVars []expression.Expression
	ExecID    uint32
	Stmt      ast.StmtNode
	Plan      Plan
	// contains filtered or unexported fields
}

Execute represents prepare plan.

func (*Execute) ResolveIndices 

func (p *Execute) ResolveIndices()

func (*Execute) Schema 

func (s *Execute) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Execute) SetSchema 

func (s *Execute) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Explain 

type Explain struct {
	StmtPlan Plan
	Rows     [][]string
	// contains filtered or unexported fields
}

Explain represents a explain plan.

func (*Explain) ResolveIndices 

func (p *Explain) ResolveIndices()

func (*Explain) Schema 

func (s *Explain) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Explain) SetSchema 

func (s *Explain) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Insert 

type Insert struct {
	Table table.Table

	Columns []*ast.ColumnName
	Lists   [][]expression.Expression
	SetList []*expression.Assignment

	OnDuplicate        []*expression.Assignment
	Schema4OnDuplicate *expression.Schema

	IsReplace bool

	// NeedFillDefaultValue is true when expr in value list reference other column.
	NeedFillDefaultValue bool

	GenCols InsertGeneratedColumns

	SelectPlan PhysicalPlan
	// contains filtered or unexported fields
}

Insert represents an insert plan.

func (*Insert) ResolveIndices 

func (p *Insert) ResolveIndices()

ResolveIndices implements Plan interface.

func (*Insert) Schema 

func (s *Insert) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Insert) SetSchema 

func (s *Insert) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type InsertGeneratedColumns 

type InsertGeneratedColumns struct {
	Columns      []*ast.ColumnName
	Exprs        []expression.Expression
	OnDuplicates []*expression.Assignment
}

InsertGeneratedColumns is for completing generated columns in Insert. We resolve generation expressions in plan, and eval those in executor.

type JoinType 

type JoinType int

JoinType contains CrossJoin, InnerJoin, LeftOuterJoin, RightOuterJoin, FullOuterJoin, SemiJoin. 

const (
	// InnerJoin means inner join.
	InnerJoin JoinType = iota
	// LeftOuterJoin means left join.
	LeftOuterJoin
	// RightOuterJoin means right join.
	RightOuterJoin
	// SemiJoin means if row a in table A matches some rows in B, just output a.
	SemiJoin
	// AntiSemiJoin means if row a in table A does not match any row in B, then output a.
	AntiSemiJoin
	// LeftOuterSemiJoin means if row a in table A matches some rows in B, output (a, true), otherwise, output (a, false).
	LeftOuterSemiJoin
	// AntiLeftOuterSemiJoin means if row a in table A matches some rows in B, output (a, false), otherwise, output (a, true).
	AntiLeftOuterSemiJoin
)

func (JoinType) String 

func (tp JoinType) String() string

type LoadData 

type LoadData struct {
	IsLocal     bool
	Path        string
	Table       *ast.TableName
	Columns     []*ast.ColumnName
	FieldsInfo  *ast.FieldsClause
	LinesInfo   *ast.LinesClause
	IgnoreLines uint64

	GenCols InsertGeneratedColumns
	// contains filtered or unexported fields
}

LoadData represents a loaddata plan.

func (*LoadData) ResolveIndices 

func (p *LoadData) ResolveIndices()

func (*LoadData) Schema 

func (s *LoadData) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*LoadData) SetSchema 

func (s *LoadData) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type LoadStats 

type LoadStats struct {
	Path string
	// contains filtered or unexported fields
}

LoadStats represents a load stats plan.

func (*LoadStats) ResolveIndices 

func (p *LoadStats) ResolveIndices()

func (*LoadStats) Schema 

func (s *LoadStats) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*LoadStats) SetSchema 

func (s *LoadStats) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type LogicalAggregation 

type LogicalAggregation struct {
	AggFuncs     []*aggregation.AggFuncDesc
	GroupByItems []expression.Expression
	// contains filtered or unexported fields
}

LogicalAggregation represents an aggregate plan.

func (*LogicalAggregation) PredicatePushDown 

func (la *LogicalAggregation) PredicatePushDown(predicates []expression.Expression) (ret []expression.Expression, retPlan LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalAggregation) PruneColumns 

func (la *LogicalAggregation) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalAggregation) Schema 

func (s *LogicalAggregation) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*LogicalAggregation) SetSchema 

func (s *LogicalAggregation) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type LogicalApply 

type LogicalApply struct {
	LogicalJoin
	// contains filtered or unexported fields
}

LogicalApply gets one row from outer executor and gets one row from inner executor according to outer row.

func (*LogicalApply) PruneColumns 

func (la *LogicalApply) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalApply) Schema 

func (s *LogicalApply) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*LogicalApply) SetSchema 

func (s *LogicalApply) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type LogicalJoin 

type LogicalJoin struct {
	JoinType JoinType

	StraightJoin bool

	EqualConditions []*expression.ScalarFunction
	LeftConditions  expression.CNFExprs
	RightConditions expression.CNFExprs
	OtherConditions expression.CNFExprs

	LeftJoinKeys  []*expression.Column
	RightJoinKeys []*expression.Column

	// DefaultValues is only used for left/right outer join, which is values the inner row's should be when the outer table
	// doesn't match any inner table's row.
	// That it's nil just means the default values is a slice of NULL.
	// Currently, only `aggregation push down` phase will set this.
	DefaultValues []types.Datum
	// contains filtered or unexported fields
}

LogicalJoin is the logical join plan.

func (*LogicalJoin) PredicatePushDown 

func (p *LogicalJoin) PredicatePushDown(predicates []expression.Expression) (ret []expression.Expression, retPlan LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalJoin) PruneColumns 

func (p *LogicalJoin) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalJoin) Schema 

func (s *LogicalJoin) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*LogicalJoin) SetSchema 

func (s *LogicalJoin) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type LogicalLimit 

type LogicalLimit struct {
	Offset uint64
	Count  uint64
	// contains filtered or unexported fields
}

LogicalLimit represents offset and limit plan.

func (*LogicalLimit) Children 

func (p *LogicalLimit) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalLimit) MaxOneRow 

func (p *LogicalLimit) MaxOneRow() bool

func (*LogicalLimit) PredicatePushDown 

func (p *LogicalLimit) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalLimit) PruneColumns 

func (p *LogicalLimit) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalLimit) Schema 

func (p *LogicalLimit) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalLimit) SetChildren 

func (p *LogicalLimit) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type LogicalLock 

type LogicalLock struct {
	Lock ast.SelectLockType
	// contains filtered or unexported fields
}

LogicalLock represents a select lock plan.

func (*LogicalLock) Children 

func (p *LogicalLock) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalLock) MaxOneRow 

func (p *LogicalLock) MaxOneRow() bool

func (*LogicalLock) PredicatePushDown 

func (p *LogicalLock) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan interface.

func (*LogicalLock) PruneColumns 

func (p *LogicalLock) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalLock) Schema 

func (p *LogicalLock) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalLock) SetChildren 

func (p *LogicalLock) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type LogicalMaxOneRow 

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

LogicalMaxOneRow checks if a query returns no more than one row.

func (*LogicalMaxOneRow) Children 

func (p *LogicalMaxOneRow) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalMaxOneRow) MaxOneRow 

func (p *LogicalMaxOneRow) MaxOneRow() bool

func (*LogicalMaxOneRow) PredicatePushDown 

func (p *LogicalMaxOneRow) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalMaxOneRow) PruneColumns 

func (p *LogicalMaxOneRow) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalMaxOneRow) Schema 

func (p *LogicalMaxOneRow) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalMaxOneRow) SetChildren 

func (p *LogicalMaxOneRow) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type LogicalPlan 

type LogicalPlan interface {
	Plan

	// PredicatePushDown pushes down the predicates in the where/on/having clauses as deeply as possible.
	// It will accept a predicate that is an expression slice, and return the expressions that can't be pushed.
	// Because it might change the root if the having clause exists, we need to return a plan that represents a new root.
	PredicatePushDown([]expression.Expression) ([]expression.Expression, LogicalPlan)

	// PruneColumns prunes the unused columns.
	PruneColumns([]*expression.Column)

	// MaxOneRow means whether this operator only returns max one row.
	MaxOneRow() bool

	// Get all the children.
	Children() []LogicalPlan

	// SetChildren sets the children for the plan.
	SetChildren(...LogicalPlan)
	// contains filtered or unexported methods
}

LogicalPlan is a tree of logical operators. We can do a lot of logical optimizations to it, like predicate pushdown and column pruning.

type LogicalProjection 

type LogicalProjection struct {
	Exprs []expression.Expression
	// contains filtered or unexported fields
}

LogicalProjection represents a select fields plan.

func (*LogicalProjection) PredicatePushDown 

func (p *LogicalProjection) PredicatePushDown(predicates []expression.Expression) (ret []expression.Expression, retPlan LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalProjection) PruneColumns 

func (p *LogicalProjection) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface. If any expression has SetVar functions, we do not prune it.

func (*LogicalProjection) Schema 

func (s *LogicalProjection) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*LogicalProjection) SetSchema 

func (s *LogicalProjection) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type LogicalSelection 

type LogicalSelection struct {

	// Originally the WHERE or ON condition is parsed into a single expression,
	// but after we converted to CNF(Conjunctive normal form), it can be
	// split into a list of AND conditions.
	Conditions []expression.Expression
	// contains filtered or unexported fields
}

LogicalSelection represents a where or having predicate.

func (*LogicalSelection) Children 

func (p *LogicalSelection) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalSelection) MaxOneRow 

func (p *LogicalSelection) MaxOneRow() bool

func (*LogicalSelection) PredicatePushDown 

func (p *LogicalSelection) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalSelection) PruneColumns 

func (p *LogicalSelection) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalSelection) Schema 

func (p *LogicalSelection) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalSelection) SetChildren 

func (p *LogicalSelection) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type LogicalSort 

type LogicalSort struct {
	ByItems []*ByItems
	// contains filtered or unexported fields
}

LogicalSort stands for the order by plan.

func (*LogicalSort) Children 

func (p *LogicalSort) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalSort) MaxOneRow 

func (p *LogicalSort) MaxOneRow() bool

func (*LogicalSort) PredicatePushDown 

func (p *LogicalSort) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan interface.

func (*LogicalSort) PruneColumns 

func (ls *LogicalSort) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalSort) Schema 

func (p *LogicalSort) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalSort) SetChildren 

func (p *LogicalSort) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type LogicalTableDual 

type LogicalTableDual struct {
	RowCount int
	// contains filtered or unexported fields
}

LogicalTableDual represents a dual table plan.

func (*LogicalTableDual) PredicatePushDown 

func (p *LogicalTableDual) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalTableDual) Schema 

func (s *LogicalTableDual) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*LogicalTableDual) SetSchema 

func (s *LogicalTableDual) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type LogicalTopN 

type LogicalTopN struct {
	ByItems []*ByItems
	Offset  uint64
	Count   uint64
	// contains filtered or unexported fields
}

LogicalTopN represents a top-n plan.

func (*LogicalTopN) Children 

func (p *LogicalTopN) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalTopN) MaxOneRow 

func (p *LogicalTopN) MaxOneRow() bool

func (*LogicalTopN) PredicatePushDown 

func (p *LogicalTopN) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan interface.

func (*LogicalTopN) PruneColumns 

func (p *LogicalTopN) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalTopN) Schema 

func (p *LogicalTopN) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalTopN) SetChildren 

func (p *LogicalTopN) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type LogicalUnionAll 

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

LogicalUnionAll represents LogicalUnionAll plan.

func (*LogicalUnionAll) Children 

func (p *LogicalUnionAll) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalUnionAll) MaxOneRow 

func (p *LogicalUnionAll) MaxOneRow() bool

func (*LogicalUnionAll) PredicatePushDown 

func (p *LogicalUnionAll) PredicatePushDown(predicates []expression.Expression) (ret []expression.Expression, retPlan LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalUnionAll) PruneColumns 

func (p *LogicalUnionAll) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalUnionAll) Schema 

func (p *LogicalUnionAll) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalUnionAll) SetChildren 

func (p *LogicalUnionAll) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type LogicalUnionScan 

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

LogicalUnionScan is only used in non read-only txn.

func (*LogicalUnionScan) Children 

func (p *LogicalUnionScan) Children() []LogicalPlan

Children implements LogicalPlan Children interface.

func (*LogicalUnionScan) MaxOneRow 

func (p *LogicalUnionScan) MaxOneRow() bool

func (*LogicalUnionScan) PredicatePushDown 

func (p *LogicalUnionScan) PredicatePushDown(predicates []expression.Expression) ([]expression.Expression, LogicalPlan)

PredicatePushDown implements LogicalPlan PredicatePushDown interface.

func (*LogicalUnionScan) PruneColumns 

func (p *LogicalUnionScan) PruneColumns(parentUsedCols []*expression.Column)

PruneColumns implements LogicalPlan interface.

func (*LogicalUnionScan) Schema 

func (p *LogicalUnionScan) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*LogicalUnionScan) SetChildren 

func (p *LogicalUnionScan) SetChildren(children ...LogicalPlan)

SetChildren implements LogicalPlan SetChildren interface.

type NominalSort 

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

NominalSort asks sort properties for its child. It is a fake operator that will not appear in final physical operator tree.

func (*NominalSort) Children 

func (p *NominalSort) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*NominalSort) ExplainInfo 

func (p *NominalSort) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*NominalSort) ResolveIndices 

func (p *NominalSort) ResolveIndices()

ResolveIndices implements Plan interface.

func (*NominalSort) Schema 

func (p *NominalSort) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*NominalSort) SetChildren 

func (p *NominalSort) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*NominalSort) StatsCount 

func (p *NominalSort) StatsCount() float64

func (*NominalSort) ToPB 

func (p *NominalSort) ToPB(_ sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PSTMTPlanCacheValue 

type PSTMTPlanCacheValue struct {
	Plan Plan
}

PSTMTPlanCacheValue stores the cached Statement and StmtNode.

func NewPSTMTPlanCacheValue 

func NewPSTMTPlanCacheValue(plan Plan) *PSTMTPlanCacheValue

NewPSTMTPlanCacheValue creates a SQLCacheValue.

type PhysicalApply 

type PhysicalApply struct {
	PhysicalJoin *PhysicalHashJoin
	OuterSchema  []*expression.CorrelatedColumn
	// contains filtered or unexported fields
}

PhysicalApply represents apply plan, only used for subquery.

func (*PhysicalApply) ExplainInfo 

func (p *PhysicalApply) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalApply) ResolveIndices 

func (p *PhysicalApply) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalApply) Schema 

func (s *PhysicalApply) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalApply) SetSchema 

func (s *PhysicalApply) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalHashAgg 

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

PhysicalHashAgg is hash operator of aggregate.

func (*PhysicalHashAgg) ExplainInfo 

func (p *PhysicalHashAgg) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalHashAgg) ResolveIndices 

func (p *PhysicalHashAgg) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalHashAgg) ToPB 

func (p *PhysicalHashAgg) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalHashJoin 

type PhysicalHashJoin struct {
	JoinType JoinType

	EqualConditions []*expression.ScalarFunction
	LeftConditions  []expression.Expression
	RightConditions []expression.Expression
	OtherConditions []expression.Expression
	// InnerChildIdx indicates which child is to build the hash table.
	// For inner join, the smaller one will be chosen.
	// For outer join or semi join, it's exactly the inner one.
	InnerChildIdx int
	Concurrency   uint

	DefaultValues []types.Datum
	// contains filtered or unexported fields
}

PhysicalHashJoin represents hash join for inner/ outer join.

func (*PhysicalHashJoin) ExplainInfo 

func (p *PhysicalHashJoin) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalHashJoin) ResolveIndices 

func (p *PhysicalHashJoin) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalHashJoin) Schema 

func (s *PhysicalHashJoin) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalHashJoin) SetSchema 

func (s *PhysicalHashJoin) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalIndexJoin 

type PhysicalIndexJoin struct {
	JoinType        JoinType
	OuterJoinKeys   []*expression.Column
	InnerJoinKeys   []*expression.Column
	LeftConditions  expression.CNFExprs
	RightConditions expression.CNFExprs
	OtherConditions expression.CNFExprs
	OuterIndex      int

	DefaultValues []types.Datum

	// Ranges stores the IndexRanges when the inner plan is index scan.
	Ranges []*ranger.Range
	// KeyOff2IdxOff maps the offsets in join key to the offsets in the index.
	KeyOff2IdxOff []int
	// contains filtered or unexported fields
}

PhysicalIndexJoin represents the plan of index look up join.

func (*PhysicalIndexJoin) ExplainInfo 

func (p *PhysicalIndexJoin) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalIndexJoin) ResolveIndices 

func (p *PhysicalIndexJoin) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalIndexJoin) Schema 

func (s *PhysicalIndexJoin) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalIndexJoin) SetSchema 

func (s *PhysicalIndexJoin) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalIndexLookUpReader 

type PhysicalIndexLookUpReader struct {

	// IndexPlans flats the indexPlan to construct executor pb.
	IndexPlans []PhysicalPlan
	// TablePlans flats the tablePlan to construct executor pb.
	TablePlans []PhysicalPlan
	// contains filtered or unexported fields
}

PhysicalIndexLookUpReader is the index look up reader in tidb. It's used in case of double reading.

func (*PhysicalIndexLookUpReader) ExplainInfo 

func (p *PhysicalIndexLookUpReader) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalIndexLookUpReader) ResolveIndices 

func (p *PhysicalIndexLookUpReader) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalIndexLookUpReader) Schema 

func (s *PhysicalIndexLookUpReader) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalIndexLookUpReader) SetSchema 

func (s *PhysicalIndexLookUpReader) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalIndexReader 

type PhysicalIndexReader struct {

	// IndexPlans flats the indexPlan to construct executor pb.
	IndexPlans []PhysicalPlan

	// OutputColumns represents the columns that index reader should return.
	OutputColumns []*expression.Column
	// contains filtered or unexported fields
}

PhysicalIndexReader is the index reader in tidb.

func (*PhysicalIndexReader) ExplainInfo 

func (p *PhysicalIndexReader) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalIndexReader) ResolveIndices 

func (p *PhysicalIndexReader) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalIndexReader) Schema 

func (s *PhysicalIndexReader) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalIndexReader) SetSchema 

func (s *PhysicalIndexReader) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalIndexScan 

type PhysicalIndexScan struct {

	// AccessCondition is used to calculate range.
	AccessCondition []expression.Expression

	Table      *model.TableInfo
	Index      *model.IndexInfo
	IdxCols    []*expression.Column
	IdxColLens []int
	Ranges     []*ranger.Range
	Columns    []*model.ColumnInfo
	DBName     model.CIStr
	Desc       bool
	KeepOrder  bool
	// DoubleRead means if the index executor will read kv two times.
	// If the query requires the columns that don't belong to index, DoubleRead will be true.
	DoubleRead bool

	TableAsName *model.CIStr

	// Hist is the histogram when the query was issued.
	// It is used for query feedback.
	Hist *statistics.Histogram
	// contains filtered or unexported fields
}

PhysicalIndexScan represents an index scan plan.

func (*PhysicalIndexScan) ExplainInfo 

func (p *PhysicalIndexScan) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalIndexScan) IsPartition 

func (p *PhysicalIndexScan) IsPartition() (bool, int64)

IsPartition returns true and partition ID if it works on a partition.

func (*PhysicalIndexScan) IsPointGetByUniqueKey 

func (p *PhysicalIndexScan) IsPointGetByUniqueKey(sc *stmtctx.StatementContext) bool

IsPointGetByUniqueKey checks whether is a point get by unique key.

func (*PhysicalIndexScan) ResolveIndices 

func (p *PhysicalIndexScan) ResolveIndices()

func (*PhysicalIndexScan) Schema 

func (s *PhysicalIndexScan) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalIndexScan) SetSchema 

func (s *PhysicalIndexScan) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

func (*PhysicalIndexScan) ToPB 

func (p *PhysicalIndexScan) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalLimit 

type PhysicalLimit struct {
	Offset uint64
	Count  uint64
	// contains filtered or unexported fields
}

PhysicalLimit is the physical operator of Limit.

func (*PhysicalLimit) Children 

func (p *PhysicalLimit) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalLimit) ExplainInfo 

func (p *PhysicalLimit) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalLimit) ResolveIndices 

func (p *PhysicalLimit) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalLimit) Schema 

func (p *PhysicalLimit) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalLimit) SetChildren 

func (p *PhysicalLimit) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalLimit) StatsCount 

func (p *PhysicalLimit) StatsCount() float64

func (*PhysicalLimit) ToPB 

func (p *PhysicalLimit) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalLock 

type PhysicalLock struct {
	Lock ast.SelectLockType
	// contains filtered or unexported fields
}

PhysicalLock is the physical operator of lock, which is used for `select ... for update` clause.

func (*PhysicalLock) Children 

func (p *PhysicalLock) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalLock) ExplainInfo 

func (p *PhysicalLock) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalLock) ResolveIndices 

func (p *PhysicalLock) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalLock) Schema 

func (p *PhysicalLock) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalLock) SetChildren 

func (p *PhysicalLock) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalLock) StatsCount 

func (p *PhysicalLock) StatsCount() float64

func (*PhysicalLock) ToPB 

func (p *PhysicalLock) ToPB(_ sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalMaxOneRow 

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

PhysicalMaxOneRow is the physical operator of maxOneRow.

func (*PhysicalMaxOneRow) Children 

func (p *PhysicalMaxOneRow) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalMaxOneRow) ExplainInfo 

func (p *PhysicalMaxOneRow) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalMaxOneRow) ResolveIndices 

func (p *PhysicalMaxOneRow) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalMaxOneRow) Schema 

func (p *PhysicalMaxOneRow) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalMaxOneRow) SetChildren 

func (p *PhysicalMaxOneRow) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalMaxOneRow) StatsCount 

func (p *PhysicalMaxOneRow) StatsCount() float64

func (*PhysicalMaxOneRow) ToPB 

func (p *PhysicalMaxOneRow) ToPB(_ sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalMemTable 

type PhysicalMemTable struct {
	DBName      model.CIStr
	Table       *model.TableInfo
	Columns     []*model.ColumnInfo
	TableAsName *model.CIStr
	// contains filtered or unexported fields
}

PhysicalMemTable reads memory table.

func (*PhysicalMemTable) ResolveIndices 

func (p *PhysicalMemTable) ResolveIndices()

func (*PhysicalMemTable) Schema 

func (s *PhysicalMemTable) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalMemTable) SetSchema 

func (s *PhysicalMemTable) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalMergeJoin 

type PhysicalMergeJoin struct {
	JoinType JoinType

	LeftConditions  []expression.Expression
	RightConditions []expression.Expression
	OtherConditions []expression.Expression

	DefaultValues []types.Datum

	LeftKeys  []*expression.Column
	RightKeys []*expression.Column
	// contains filtered or unexported fields
}

PhysicalMergeJoin represents merge join for inner/ outer join.

func (*PhysicalMergeJoin) ExplainInfo 

func (p *PhysicalMergeJoin) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalMergeJoin) ResolveIndices 

func (p *PhysicalMergeJoin) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalMergeJoin) Schema 

func (s *PhysicalMergeJoin) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalMergeJoin) SetSchema 

func (s *PhysicalMergeJoin) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalPlan 

type PhysicalPlan interface {
	Plan

	// ToPB converts physical plan to tipb executor.
	ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

	// ExplainInfo returns operator information to be explained.
	ExplainInfo() string

	// StatsCount returns the count of property.StatsInfo for this plan.
	StatsCount() float64

	// Get all the children.
	Children() []PhysicalPlan

	// SetChildren sets the children for the plan.
	SetChildren(...PhysicalPlan)

	// ResolveIndices resolves the indices for columns. After doing this, the columns can evaluate the rows by their indices.
	ResolveIndices()
	// contains filtered or unexported methods
}

PhysicalPlan is a tree of the physical operators.

type PhysicalProjection 

type PhysicalProjection struct {
	Exprs            []expression.Expression
	CalculateNoDelay bool
	// contains filtered or unexported fields
}

PhysicalProjection is the physical operator of projection.

func (*PhysicalProjection) ExplainInfo 

func (p *PhysicalProjection) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalProjection) ResolveIndices 

func (p *PhysicalProjection) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalProjection) Schema 

func (s *PhysicalProjection) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalProjection) SetSchema 

func (s *PhysicalProjection) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalSelection 

type PhysicalSelection struct {
	Conditions []expression.Expression
	// contains filtered or unexported fields
}

PhysicalSelection represents a filter.

func (*PhysicalSelection) Children 

func (p *PhysicalSelection) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalSelection) ExplainInfo 

func (p *PhysicalSelection) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalSelection) ResolveIndices 

func (p *PhysicalSelection) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalSelection) Schema 

func (p *PhysicalSelection) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalSelection) SetChildren 

func (p *PhysicalSelection) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalSelection) StatsCount 

func (p *PhysicalSelection) StatsCount() float64

func (*PhysicalSelection) ToPB 

func (p *PhysicalSelection) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalSort 

type PhysicalSort struct {
	ByItems []*ByItems
	// contains filtered or unexported fields
}

PhysicalSort is the physical operator of sort, which implements a memory sort.

func (*PhysicalSort) Children 

func (p *PhysicalSort) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalSort) ExplainInfo 

func (p *PhysicalSort) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalSort) ResolveIndices 

func (p *PhysicalSort) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalSort) Schema 

func (p *PhysicalSort) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalSort) SetChildren 

func (p *PhysicalSort) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalSort) StatsCount 

func (p *PhysicalSort) StatsCount() float64

func (*PhysicalSort) ToPB 

func (p *PhysicalSort) ToPB(_ sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalStreamAgg 

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

PhysicalStreamAgg is stream operator of aggregate.

func (*PhysicalStreamAgg) ExplainInfo 

func (p *PhysicalStreamAgg) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalStreamAgg) ResolveIndices 

func (p *PhysicalStreamAgg) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalStreamAgg) ToPB 

func (p *PhysicalStreamAgg) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalTableDual 

type PhysicalTableDual struct {
	RowCount int
	// contains filtered or unexported fields
}

PhysicalTableDual is the physical operator of dual.

func (*PhysicalTableDual) ExplainInfo 

func (p *PhysicalTableDual) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalTableDual) ResolveIndices 

func (p *PhysicalTableDual) ResolveIndices()

func (*PhysicalTableDual) Schema 

func (s *PhysicalTableDual) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalTableDual) SetSchema 

func (s *PhysicalTableDual) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalTableReader 

type PhysicalTableReader struct {

	// TablePlans flats the tablePlan to construct executor pb.
	TablePlans []PhysicalPlan
	// contains filtered or unexported fields
}

PhysicalTableReader is the table reader in tidb.

func (*PhysicalTableReader) ExplainInfo 

func (p *PhysicalTableReader) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalTableReader) ResolveIndices 

func (p *PhysicalTableReader) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalTableReader) Schema 

func (s *PhysicalTableReader) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalTableReader) SetSchema 

func (s *PhysicalTableReader) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type PhysicalTableScan 

type PhysicalTableScan struct {

	// AccessCondition is used to calculate range.
	AccessCondition []expression.Expression

	Table   *model.TableInfo
	Columns []*model.ColumnInfo
	DBName  model.CIStr
	Desc    bool
	Ranges  []*ranger.Range

	TableAsName *model.CIStr

	// KeepOrder is true, if sort data by scanning pkcol,
	KeepOrder bool

	// Hist is the histogram when the query was issued.
	// It is used for query feedback.
	Hist *statistics.Histogram
	// contains filtered or unexported fields
}

PhysicalTableScan represents a table scan plan.

func (*PhysicalTableScan) ExplainInfo 

func (p *PhysicalTableScan) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalTableScan) IsPartition 

func (ts *PhysicalTableScan) IsPartition() (bool, int64)

IsPartition returns true and partition ID if it's actually a partition.

func (*PhysicalTableScan) ResolveIndices 

func (p *PhysicalTableScan) ResolveIndices()

func (*PhysicalTableScan) Schema 

func (s *PhysicalTableScan) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*PhysicalTableScan) SetSchema 

func (s *PhysicalTableScan) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

func (*PhysicalTableScan) ToPB 

func (p *PhysicalTableScan) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalTopN 

type PhysicalTopN struct {
	ByItems []*ByItems
	Offset  uint64
	Count   uint64
	// contains filtered or unexported fields
}

PhysicalTopN is the physical operator of topN.

func (*PhysicalTopN) Children 

func (p *PhysicalTopN) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalTopN) ExplainInfo 

func (p *PhysicalTopN) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalTopN) ResolveIndices 

func (p *PhysicalTopN) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalTopN) Schema 

func (p *PhysicalTopN) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalTopN) SetChildren 

func (p *PhysicalTopN) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalTopN) StatsCount 

func (p *PhysicalTopN) StatsCount() float64

func (*PhysicalTopN) ToPB 

func (p *PhysicalTopN) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalUnionAll 

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

PhysicalUnionAll is the physical operator of UnionAll.

func (*PhysicalUnionAll) Children 

func (p *PhysicalUnionAll) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalUnionAll) ExplainInfo 

func (p *PhysicalUnionAll) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalUnionAll) ResolveIndices 

func (p *PhysicalUnionAll) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalUnionAll) Schema 

func (p *PhysicalUnionAll) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalUnionAll) SetChildren 

func (p *PhysicalUnionAll) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalUnionAll) StatsCount 

func (p *PhysicalUnionAll) StatsCount() float64

func (*PhysicalUnionAll) ToPB 

func (p *PhysicalUnionAll) ToPB(_ sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type PhysicalUnionScan 

type PhysicalUnionScan struct {
	Conditions []expression.Expression
	// contains filtered or unexported fields
}

PhysicalUnionScan represents a union scan operator.

func (*PhysicalUnionScan) Children 

func (p *PhysicalUnionScan) Children() []PhysicalPlan

Children implements PhysicalPlan Children interface.

func (*PhysicalUnionScan) ExplainInfo 

func (p *PhysicalUnionScan) ExplainInfo() string

ExplainInfo implements PhysicalPlan interface.

func (*PhysicalUnionScan) ResolveIndices 

func (p *PhysicalUnionScan) ResolveIndices()

ResolveIndices implements Plan interface.

func (*PhysicalUnionScan) Schema 

func (p *PhysicalUnionScan) Schema() *expression.Schema

Schema implements Plan Schema interface.

func (*PhysicalUnionScan) SetChildren 

func (p *PhysicalUnionScan) SetChildren(children ...PhysicalPlan)

SetChildren implements PhysicalPlan SetChildren interface.

func (*PhysicalUnionScan) StatsCount 

func (p *PhysicalUnionScan) StatsCount() float64

func (*PhysicalUnionScan) ToPB 

func (p *PhysicalUnionScan) ToPB(_ sessionctx.Context) (*tipb.Executor, error)

ToPB implements PhysicalPlan ToPB interface.

type Plan 

type Plan interface {
	// Get the schema.
	Schema() *expression.Schema
	// Get the ID.
	ID() int
	// Get the ID in explain statement
	ExplainID() string
	// contains filtered or unexported methods
}

Plan is the description of an execution flow. It is created from ast.Node first, then optimized by the optimizer, finally used by the executor to create a Cursor which executes the statement.

func BuildLogicalPlan 

func BuildLogicalPlan(ctx sessionctx.Context, node ast.Node, is infoschema.InfoSchema) (Plan, error)

BuildLogicalPlan used to build logical plan from ast.Node.

func Optimize 

func Optimize(ctx sessionctx.Context, node ast.Node, is infoschema.InfoSchema) (Plan, error)

Optimize does optimization and creates a Plan. The node must be prepared first.

type PointGetPlan 

type PointGetPlan struct {
	TblInfo     *model.TableInfo
	IndexInfo   *model.IndexInfo
	Handle      int64
	IndexValues []types.Datum
	// contains filtered or unexported fields
}

PointGetPlan is a fast plan for simple point get. When we detect that the statement has a unique equal access condition, this plan is used. This plan is much faster to build and to execute because it avoid the optimization and coprocessor cost.

func (*PointGetPlan) Children 

func (p *PointGetPlan) Children() []PhysicalPlan

Children gets all the children.

func (*PointGetPlan) ExplainID 

func (p *PointGetPlan) ExplainID() string

func (*PointGetPlan) ExplainInfo 

func (p *PointGetPlan) ExplainInfo() string

ExplainInfo returns operator information to be explained.

func (*PointGetPlan) ID 

func (p *PointGetPlan) ID() int

ID implements Plan ID interface.

func (*PointGetPlan) ResolveIndices 

func (p *PointGetPlan) ResolveIndices()

ResolveIndices resolves the indices for columns. After doing this, the columns can evaluate the rows by their indices.

func (*PointGetPlan) Schema 

func (p *PointGetPlan) Schema() *expression.Schema

Schema implements the Plan interface.

func (*PointGetPlan) SetChildren 

func (p *PointGetPlan) SetChildren(...PhysicalPlan)

SetChildren sets the children for the plan.

func (*PointGetPlan) StatsCount 

func (p *PointGetPlan) StatsCount() float64

StatsCount will return the the RowCount of property.StatsInfo for this plan.

func (*PointGetPlan) ToPB 

func (p *PointGetPlan) ToPB(ctx sessionctx.Context) (*tipb.Executor, error)

ToPB converts physical plan to tipb executor.

type Prepare 

type Prepare struct {
	Name    string
	SQLText string
	// contains filtered or unexported fields
}

Prepare represents prepare plan.

func (*Prepare) ResolveIndices 

func (p *Prepare) ResolveIndices()

func (*Prepare) Schema 

func (s *Prepare) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Prepare) SetSchema 

func (s *Prepare) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Prepared 

type Prepared struct {
	Stmt          ast.StmtNode
	Params        []*ast.ParamMarkerExpr
	SchemaVersion int64
	UseCache      bool
}

Prepared represents a prepared statement.

type RecoverIndex 

type RecoverIndex struct {
	Table     *ast.TableName
	IndexName string
	// contains filtered or unexported fields
}

RecoverIndex is used for backfilling corrupted index data.

func (*RecoverIndex) ResolveIndices 

func (p *RecoverIndex) ResolveIndices()

func (*RecoverIndex) Schema 

func (s *RecoverIndex) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*RecoverIndex) SetSchema 

func (s *RecoverIndex) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Set 

type Set struct {
	VarAssigns []*expression.VarAssignment
	// contains filtered or unexported fields
}

Set represents a plan for set stmt.

func (*Set) ResolveIndices 

func (p *Set) ResolveIndices()

func (*Set) Schema 

func (s *Set) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Set) SetSchema 

func (s *Set) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Show 

type Show struct {
	Tp     ast.ShowStmtType // Databases/Tables/Columns/....
	DBName string
	Table  *ast.TableName  // Used for showing columns.
	Column *ast.ColumnName // Used for `desc table column`.
	Flag   int             // Some flag parsed from sql, such as FULL.
	Full   bool
	User   *auth.UserIdentity // Used for show grants.

	Conditions []expression.Expression

	// Used by show variables
	GlobalScope bool
	// contains filtered or unexported fields
}

Show represents a show plan.

func (*Show) ResolveIndices 

func (p *Show) ResolveIndices()

ResolveIndices implements Plan interface.

func (*Show) Schema 

func (s *Show) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Show) SetSchema 

func (s *Show) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type ShowDDL 

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

ShowDDL is for showing DDL information.

func (*ShowDDL) ResolveIndices 

func (p *ShowDDL) ResolveIndices()

func (*ShowDDL) Schema 

func (s *ShowDDL) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*ShowDDL) SetSchema 

func (s *ShowDDL) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type ShowDDLJobQueries 

type ShowDDLJobQueries struct {
	JobIDs []int64
	// contains filtered or unexported fields
}

ShowDDLJobQueries is for showing DDL job queries sql.

func (*ShowDDLJobQueries) ResolveIndices 

func (p *ShowDDLJobQueries) ResolveIndices()

func (*ShowDDLJobQueries) Schema 

func (s *ShowDDLJobQueries) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*ShowDDLJobQueries) SetSchema 

func (s *ShowDDLJobQueries) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type ShowDDLJobs 

type ShowDDLJobs struct {
	JobNumber int64
	// contains filtered or unexported fields
}

ShowDDLJobs is for showing DDL job list.

func (*ShowDDLJobs) ResolveIndices 

func (p *ShowDDLJobs) ResolveIndices()

func (*ShowDDLJobs) Schema 

func (s *ShowDDLJobs) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*ShowDDLJobs) SetSchema 

func (s *ShowDDLJobs) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Simple 

type Simple struct {
	Statement ast.StmtNode
	// contains filtered or unexported fields
}

Simple represents a simple statement plan which doesn't need any optimization.

func (*Simple) ResolveIndices 

func (p *Simple) ResolveIndices()

func (*Simple) Schema 

func (s *Simple) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Simple) SetSchema 

func (s *Simple) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Trace 

type Trace struct {
	StmtNode ast.StmtNode
	// contains filtered or unexported fields
}

Trace represents a trace plan.

func (*Trace) ResolveIndices 

func (p *Trace) ResolveIndices()

func (*Trace) Schema 

func (s *Trace) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Trace) SetSchema 

func (s *Trace) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

type Update 

type Update struct {
	OrderedList []*expression.Assignment

	SelectPlan PhysicalPlan
	// contains filtered or unexported fields
}

Update represents Update plan.

func (*Update) ResolveIndices 

func (p *Update) ResolveIndices()

ResolveIndices implements Plan interface.

func (*Update) Schema 

func (s *Update) Schema() *expression.Schema

Schema implements the Plan.Schema interface.

func (*Update) SetSchema 

func (s *Update) SetSchema(schema *expression.Schema)

SetSchema implements the Plan.SetSchema interface.

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