util

Documentation

Index

• Variables
• func CheckIndexCanBeKey(idx *model.IndexInfo, columns []*model.ColumnInfo, schema *expression.Schema) (uniqueKey, newKey expression.KeyInfo)
• func CheckMaxOneRowCond(eqColIDs map[int64]struct{}, childSchema *expression.Schema) bool
• func ResolveColumnAndReplace(origin *expression.Column, replace map[string]*expression.Column)
• func ResolveExprAndReplace(origin expression.Expression, replace map[string]*expression.Column)

Variables

var BuildKeyInfoPortal func(lp base.LogicalPlan)

BuildKeyInfoPortal is a hook for other packages to build key info for logical plan.

var SetPredicatePushDownFlag func(uint64) uint64

SetPredicatePushDownFlag is a hook for other packages to set rule flag.

Functions

func CheckIndexCanBeKey

func CheckIndexCanBeKey(idx *model.IndexInfo, columns []*model.ColumnInfo, schema *expression.Schema) (uniqueKey, newKey expression.KeyInfo)

CheckIndexCanBeKey checks whether an Index can be a Key in schema.

func CheckMaxOneRowCond

func CheckMaxOneRowCond(eqColIDs map[int64]struct{}, childSchema *expression.Schema) bool

CheckMaxOneRowCond check if a condition is the form of (uniqueKey = constant) or (uniqueKey = Correlated column), it returns at most one row.

func ResolveColumnAndReplace

func ResolveColumnAndReplace(origin *expression.Column, replace map[string]*expression.Column)

ResolveColumnAndReplace replaces columns fields of expressions by children logical plans.

func ResolveExprAndReplace

func ResolveExprAndReplace(origin expression.Expression, replace map[string]*expression.Column)

ResolveExprAndReplace replaces columns fields of expressions by children logical plans.