Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/12040#discussion_r58121898 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/Window.scala --- @@ -920,7 +931,7 @@ private[execution] object AggregateProcessor { // Create the projections. val initialProjection = newMutableProjection( initialValues, - Seq(SizeBasedWindowFunction.n))() + Seq(partitionSize))() --- End diff -- OK I see. I think I am confused about the reason that the inputSchema of this mutable projection only contains a single column `partitionSize`. Does initialValues already have all other needed BoundReferences?
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