Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4394#discussion_r24303675
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -454,6 +455,30 @@ object PushPredicateThroughProject extends
Rule[LogicalPlan] {
}
/**
+ * Push [[Filter]] operators through [[Generate]] operators. Part of the
predicate which referenced
+ * attributes generated in [[Generate]] will remain above, and the rest
should be pushed beneath.
+ */
+object PushPredicateThroughGenerate extends Rule[LogicalPlan] with
PredicateHelper {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ case filter @ Filter(condition,
+ generate @ Generate(generator, join, outer, alias, grandChild)) =>
+ // Those conjuncts referenced a attributes generated in `generate`
can not
+ // be pushed below `generate`
--- End diff --
Nit: "Predicates that reference attributes produced by the `Generate`
operator cannot be pushed below the operator."
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