Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/12040#discussion_r57784019
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Window.scala ---
@@ -937,6 +939,18 @@ private[execution] object AggregateProcessor {
imperatives.toArray,
trackPartitionSize)
}
+
+ // Tries to find and return `SizeBasedWindowFunction.n` generated on
driver side from given
+ // expressions. Returns executor side global
`SizeBasedWindowFunction.n` if none can be found.
+ def windowPartitionSizeAttribute(expressions: Seq[Expression]):
AttributeReference = {
--- End diff --
`SizeBasedWindowFunction` has an `n` function which returns this attribute.
Why not use this?
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