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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