beliefer commented on code in PR #43144:
URL: https://github.com/apache/spark/pull/43144#discussion_r1376121522
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala:
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@@ -1241,6 +1242,24 @@ object OptimizeRepartition extends Rule[LogicalPlan] {
}
}
+/**
+ * Remove window partition if partition expressions are foldable
+ */
+object EliminateWindowPartitions extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan =
plan.transformWithPruning(
+ _.containsPattern(WINDOW), ruleId) {
+ case w @ Window(windowExprs, partitionSpec, _, _) if
partitionSpec.exists(_.foldable) =>
+ val newWindowExprs = windowExprs.map(_.transformWithPruning(
+ _.containsPattern(WINDOW_EXPRESSION)) {
+ case windowExpr @ WindowExpression(_, wsd @ WindowSpecDefinition(ps,
_, _))
+ if ps.exists(_.foldable) =>
+ val newWsd = wsd.copy(partitionSpec = ps.filter(!_.foldable))
+ windowExpr.copy(windowSpec = newWsd)
Review Comment:
Please use `withNewChildren` instead.
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