join

Documentation

Index

• type XFJoinToApply
  • func NewJoinToApply() *XFJoinToApply
  • func (*XFJoinToApply) Match(_ *rule.GroupExprHolder, _ sessionctx.Context) bool
  • func (*XFJoinToApply) XForm(_ *rule.GroupExprHolder, _ sessionctx.Context) ([]*memo.GroupExpression, error)

Types

type XFJoinToApply

type XFJoinToApply struct {
	*rule.BaseRule
}

XFJoinToApply is a type of rule that aims to convert a join into apply mode, allowing runtime scalar attributes to be passed to the apply's probe side, thereby enhancing the likelihood of better index scans.

func NewJoinToApply

func NewJoinToApply() *XFJoinToApply

NewJoinToApply creates a new JoinToApply rule.

func (*XFJoinToApply) Match

func (*XFJoinToApply) Match(_ *rule.GroupExprHolder, _ sessionctx.Context) bool

Match implements the Rule interface.

func (*XFJoinToApply) XForm

func (*XFJoinToApply) XForm(_ *rule.GroupExprHolder, _ sessionctx.Context) ([]*memo.GroupExpression, error)

XForm implements thr Rule interface.