yeshengm commented on a change in pull request #25164: [SPARK-28375] Prevent
the PullupCorrelatedPredicates optimizer rule from removing predicates if run
multiple times
URL: https://github.com/apache/spark/pull/25164#discussion_r304186143
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
##########
@@ -275,13 +275,16 @@ object PullupCorrelatedPredicates extends
Rule[LogicalPlan] with PredicateHelper
plan transformExpressions {
case ScalarSubquery(sub, children, exprId) if children.nonEmpty =>
val (newPlan, newCond) = pullOutCorrelatedPredicates(sub, outerPlans)
- ScalarSubquery(newPlan, newCond, exprId)
+ val conds = newCond ++ children.filter(_.isInstanceOf[Predicate])
Review comment:
https://github.com/apache/spark/blob/f8f4ec8d4d31968d2ae5fe6bdb51f0eea25a2c92/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala#L189
What I just proposed is a two-year-old TODO anyway...
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