Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14815#discussion_r76511974
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1385,18 +1385,25 @@ object EliminateOuterJoin extends Rule[LogicalPlan]
with PredicateHelper {
*/
object PushPredicateThroughJoin extends Rule[LogicalPlan] with
PredicateHelper {
/**
- * Splits join condition expressions into three categories based on the
attributes required
- * to evaluate them.
+ * Splits join condition expressions or filter predicates (on a given
join's output) into three
+ * categories based on the attributes required to evaluate them. Note
that we explicitly exclude
+ * on-deterministic (i.e., stateful) condition expressions in
canEvaluateInLeft or
--- End diff --
type: `non-deterministic`
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