Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12720#discussion_r61653985
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1139,7 +1139,7 @@ object OuterJoinElimination extends Rule[LogicalPlan]
with PredicateHelper {
* Returns whether the expression returns null or false when all inputs
are nulls.
*/
private def canFilterOutNull(e: Expression): Boolean = {
- if (!e.deterministic) return false
+ if (!e.deterministic || PredicateSubquery.hasPredicateSubquery(e))
return false
--- End diff --
Or check if it has any unvaluable ?
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