Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11635#discussion_r60410517
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -958,6 +958,26 @@ object PushDownPredicate extends Rule[LogicalPlan]
with PredicateHelper {
project.copy(child = Filter(replaceAlias(condition, aliasMap),
grandChild))
+ // Push [[Filter]] operators through [[Window]] operators. Parts of
the predicate that can be
+ // pushed beneath must satisfy three conditions:
+ // 1. involving one and only one column that is part of window
partitioning key.
+ // 2. Window partitioning key should be just a sequence of
[[AttributeReference]].
+ // 3. deterministic
+ case filter@Filter(condition, w: Window)
+ if w.partitionSpec.forall(_.isInstanceOf[AttributeReference]) =>
+ val (pushDown, stayUp) =
splitConjunctivePredicates(condition).partition { cond =>
+ cond.references.size == 1 &&
+
cond.references.subsetOf(AttributeSet(w.partitionSpec.flatMap(_.references))) &&
--- End diff --
Sure, will do. Thanks!
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