Github user jaceklaskowski commented on a diff in the pull request: https://github.com/apache/spark/pull/18074#discussion_r118788857 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExec.scala --- @@ -153,19 +153,24 @@ 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 = { + private[this] lazy val windowFrameExpressionFactoryPairs: + Seq[(mutable.Buffer[WindowExpression], InternalRow => WindowFunctionFrame)] = + { type FrameKey = (String, FrameType, Option[Int], Option[Int]) type ExpressionBuffer = mutable.Buffer[Expression] - val framedFunctions = mutable.Map.empty[FrameKey, (ExpressionBuffer, ExpressionBuffer)] + type WindowExpressionBuffer = mutable.Buffer[WindowExpression] + val framedFunctions = mutable.Map.empty[FrameKey, (WindowExpressionBuffer, ExpressionBuffer)] // Add a function and its function to the map for a given frame. - def collect(tpe: String, fr: SpecifiedWindowFrame, e: Expression, fn: Expression): Unit = { + def collect( + tpe: String, fr: SpecifiedWindowFrame, e: WindowExpression, fn: Expression): Unit = --- End diff -- I'll revert it to not "pollute" the PR. It was much easier to read the code when the internals were less generic (that does nothing at all).
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