Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/12040#discussion_r58094429
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Window.scala ---
@@ -937,6 +945,12 @@ private[execution] object AggregateProcessor {
imperatives.toArray,
trackPartitionSize)
}
+
+ // SPARK-14244: When binding
+ def windowPartitionSizeAttribute(expressions: Array[Expression]):
AttributeReference = {
+ val aggs = expressions.flatMap(_.collectFirst { case f:
SizeBasedWindowFunction => f })
+ aggs.headOption.map(_.n).getOrElse(SizeBasedWindowFunction.n)
--- End diff --
If there's no `SizeBasedWindowFunction`, actually we don't need the window
partition size attribute, and invoking this function can be viewed as a no-op.
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