cloud-fan commented on a change in pull request #31874:
URL: https://github.com/apache/spark/pull/31874#discussion_r597132935
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/BroadcastNestedLoopJoinExec.scala
##########
@@ -452,4 +457,50 @@ case class BroadcastNestedLoopJoinExec(
|}
""".stripMargin
}
+
+ private def codegenLeftExistence(
+ ctx: CodegenContext,
+ input: Seq[ExprCode],
+ exists: Boolean): String = {
+ val (buildRowArray, buildRowArrayTerm) = prepareBroadcast(ctx)
+ val numOutput = metricTerm(ctx, "numOutputRows")
+
+ if (condition.isEmpty) {
+ if (buildRowArray.nonEmpty == exists) {
+ // Return streamed side if join condition is empty and
+ // 1. build side is non-empty for LeftSemi join
+ // or
+ // 2. build side is empty for LeftAnti join.
+ s"""
+ |$numOutput.add(1);
+ |${consume(ctx, input)}
+ """.stripMargin
+ } else {
+ // Return nothing if join condition is empty and
+ // 1. build side is empty for LeftSemi join
+ // or
+ // 2. build side is non-empty for LeftAnti join.
+ ""
+ }
+ } else {
+ val (buildRow, checkCondition, _) = getJoinCondition(ctx, input,
streamed, broadcast)
+ val findMatchedRow = ctx.freshName("findMatchedRow")
+ val arrayIndex = ctx.freshName("arrayIndex")
+
+ s"""
+ |boolean $findMatchedRow = false;
Review comment:
+1
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