joinversion

Documentation

Index

• Constants
• Variables
• func IsOptimizedVersion(hashJoinVersion string) bool

Constants

const (
	// HashJoinVersionLegacy means hash join v1
	HashJoinVersionLegacy = "legacy"
	// HashJoinVersionOptimized means hash join v2
	HashJoinVersionOptimized = "optimized"
)

Variables

var (
	// UseHashJoinV2ForNonGAJoin is added because Hash join contains a lots of types(like inner join, outer join, semi join, nullaware semi join, etc)
	// we want to GA these different kind of joins step by step, but don't want to add a new session variable for each of the join,
	// so we add this variable to control whether to use hash join v2 for nonGA joins(enable it for test, disable it in a release version).
	// PhysicalHashJoin.isGAForHashJoinV2() defines whether the join is GA for hash join v2, we can make each join GA separately by updating
	// this function one by one
	UseHashJoinV2ForNonGAJoin = false
)

Functions

func IsOptimizedVersion

func IsOptimizedVersion(hashJoinVersion string) bool

IsOptimizedVersion returns true if hashJoinVersion equals to HashJoinVersionOptimized