Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9167#discussion_r42527600
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -675,6 +676,29 @@ object PushPredicateThroughGenerate extends
Rule[LogicalPlan] with PredicateHelp
}
/**
+ * Push [[Filter]] operators through [[Aggregate]] operators. Parts of the
predicate that reference
+ * attributes which are subset of group by attribute set of [[Aggregate]]
will be pushed beneath,
+ * and the rest should remain above.
+ */
+object PushPredicateThroughAggregate extends Rule[LogicalPlan] with
PredicateHelper {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ case filter @ Filter(condition,
+ aggregate @ Aggregate(groupingExpressions, aggregateExpressions,
grandChild)) =>
--- End diff --
nit: indentation. I'm not sure we have a strict rule, but no indent is
kinda hard to follow. I'd probably try to make it a tree if it fits?
```scala
case filter @ Filter(condition,
aggregate @ Aggregate(groupingExpressions, aggregateExpressions,
grandChild)) =>
```
or just 4 space indent?
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