Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11635#discussion_r55903553
--- 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 am just reading the way how Hive did the work. Actually, this is also my
question.
https://issues.apache.org/jira/secure/attachment/12788757/HIVE-12808.05.patch
In this patch, you can see there are test cases to avoid this case.
`Test predicate is not getting pushed down when window has compound
partition key`
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