wangyum commented on a change in pull request #31677:
URL: https://github.com/apache/spark/pull/31677#discussion_r602817891
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
##########
@@ -914,13 +914,27 @@ object OptimizeWindowFunctions extends Rule[LogicalPlan] {
*/
object CollapseWindow extends Rule[LogicalPlan] {
def apply(plan: LogicalPlan): LogicalPlan = plan transformUp {
- case w1 @ Window(we1, ps1, os1, w2 @ Window(we2, ps2, os2, grandChild))
- if ps1 == ps2 && os1 == os2 &&
w1.references.intersect(w2.windowOutputSet).isEmpty &&
- we1.nonEmpty && we2.nonEmpty &&
- // This assumes Window contains the same type of window expressions.
This is ensured
- // by ExtractWindowFunctions.
- WindowFunctionType.functionType(we1.head) ==
WindowFunctionType.functionType(we2.head) =>
+ case w1 @ Window(we1, _, _, w2 @ Window(we2, _, _, grandChild))
+ if windowsCompatible(w1, w2) =>
w1.copy(windowExpressions = we2 ++ we1, child = grandChild)
+
+ case w1 @ Window(we1, _, _, Project(pl, w2 @ Window(we2, _, _,
grandChild)))
+ if windowsCompatible(w1, w2) &&
w1.references.subsetOf(grandChild.outputSet) =>
+ Project(
+ pl ++ w1.windowOutputSet,
+ w1.copy(windowExpressions = we2 ++ we1, child = grandChild)
+ )
Review comment:
```scala
Project(
pl ++ w1.windowOutputSet,
w1.copy(windowExpressions = we2 ++ we1, child = grandChild)
)
```
to
```scala
Project(
pl ++ w1.windowOutputSet,
w1.copy(windowExpressions = we2 ++ we1, child = grandChild))
```
?
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