Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11635#discussion_r60409868
--- 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.
--- End diff --
For example, we are unable to push the predicate `(key + value) > '2'` in
the following query. Predicate push down will change the value of `sum(key)`
```SQL
select * from (SELECT key, value, sum(key) over(partition by key, value) as
c1 from src)r1 where (key + value) > '2';
```
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