Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14713#discussion_r75439649
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1208,17 +1208,27 @@ object PushDownPredicate extends Rule[LogicalPlan]
with PredicateHelper {
filter
}
- // two filters should be combine together by other rules
- case filter @ Filter(_, _: Filter) => filter
- // should not push predicates through sample, or will generate
different results.
- case filter @ Filter(_, _: Sample) => filter
-
- case filter @ Filter(condition, u: UnaryNode) if
u.expressions.forall(_.deterministic) =>
+ case filter @ Filter(condition, u: UnaryNode)
+ if canPushThrough(u) && u.expressions.forall(_.deterministic) =>
pushDownPredicate(filter, u.child) { predicate =>
u.withNewChildren(Seq(Filter(predicate, u.child)))
}
}
+ private def canPushThrough(p: UnaryNode): Boolean = p match {
--- End diff --
i added some comment
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