Github user jaceklaskowski commented on a diff in the pull request: https://github.com/apache/spark/pull/18074#discussion_r119168394 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExec.scala --- @@ -153,12 +153,13 @@ case class WindowExec( } /** - * Collection containing an entry for each window frame to process. Each entry contains a frames' - * WindowExpressions and factory function for the WindowFrameFunction. + * Collection containing an entry for each window frame to process. Each entry contains a frame's + * [[WindowExpression]]s and factory function for the WindowFrameFunction. */ private[this] lazy val windowFrameExpressionFactoryPairs = { type FrameKey = (String, FrameType, Option[Int], Option[Int]) type ExpressionBuffer = mutable.Buffer[Expression] + type WindowExpressionBuffer = mutable.Buffer[WindowExpression] --- End diff -- Sorry. Reverted the change manually and looks like it slipped through the cracks. Apologies.
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