Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/17122#discussion_r104472986
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
---
@@ -206,6 +206,21 @@ trait CodegenSupport extends SparkPlan {
def doConsume(ctx: CodegenContext, input: Seq[ExprCode], row: ExprCode):
String = {
throw new UnsupportedOperationException
}
+
+ /**
+ * For optimization to suppress shouldStop() in a loop of
WholeStageCodegen.
+ * Returning true means we need to insert shouldStop() into the loop
producing rows, if any.
+ */
+ def isShouldStopRequired: Boolean = {
+ return shouldStopRequired && !(this.parent != null &&
!this.parent.isShouldStopRequired)
+ }
+
+ /**
+ * Set to false if this plan consumes all rows produced by children but
doesn't output row
+ * to buffer by calling append(), so the children don't require
shouldStop()
+ * in the loop of producing rows.
+ */
+ protected def shouldStopRequired: Boolean = true
--- End diff --
The only reason I mentioned sort is that there is no use in stopping early
and that it would not be correct to do so. I was not really expecting any
improvement.
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