Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11635#discussion_r55904257
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -932,6 +933,33 @@ object PushPredicateThroughGenerate extends
Rule[LogicalPlan] with PredicateHelp
}
/**
+ * 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]].
--- End diff --
I think I might know the reason. When the partitioning key is like `k1 +
k2`, if we push down the predicates `k1 + 2`, it will change the rows in the
window.
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