beliefer commented on a change in pull request #30387:
URL: https://github.com/apache/spark/pull/30387#discussion_r544089977
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala
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@@ -116,13 +116,21 @@ trait WindowExecBase extends UnaryExecNode {
* [[WindowExpression]]s and factory function for the
[[WindowFrameFunction]].
*/
protected lazy val windowFrameExpressionFactoryPairs = {
- type FrameKey = (String, FrameType, Expression, Expression)
+ type FrameKey = (String, FrameType, Expression, Expression,
Seq[Expression])
type ExpressionBuffer = mutable.Buffer[Expression]
val framedFunctions = mutable.Map.empty[FrameKey, (ExpressionBuffer,
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 = {
- val key = (tpe, fr.frameType, fr.lower, fr.upper)
+ val key = fn match {
+ // This branch is used for Lead/Lag to support ignoring null.
+ // All window frames move in rows. If there are multiple Leads or Lags
acting on a row
+ // and operating on different input expressions, they should not be
moved uniformly
+ // by row. Therefore, we put these functions in different window
frames.
+ case f: FrameLessOffsetWindowFunction if f.ignoreNulls =>
+ (tpe, fr.frameType, fr.lower, fr.upper,
f.children.map(_.canonicalized))
+ case _ => (tpe, fr.frameType, fr.lower, fr.upper, null)
Review comment:
OK
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