MergeJoin

MergeJoinExec Struct

// MergeJoinExec implements the merge join algorithm.
// This operator assumes that two iterators of both sides
// will provide required order on join condition:
// 1. For equal-join, one of the join key from each side
// matches the order given.
// 2. For other cases its preferred not to use SMJ and operator
// will throw error.
type MergeJoinExec struct {
	baseExecutor

	stmtCtx      *stmtctx.StatementContext
	compareFuncs []expression.CompareFunc
	joiner       joiner
	isOuterJoin  bool
	desc         bool

	innerTable *mergeJoinTable
	outerTable *mergeJoinTable

	hasMatch bool
	hasNull  bool

	memTracker  *memory.Tracker
	diskTracker *disk.Tracker
}