Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/12040#discussion_r58118885 --- 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 -- The actual buffer will have more values, right? We always put partitionSize at the first value? Or, if we do not have a sized based function, we will later set the first value again?
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