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_r304185908
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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:
FYI, I just checked that `dedupOuterReferencesInSubqueries` is in the
analyzer rule and thus we can safely add the guard here. Also, we might
consider combine `PullupCorrelatedPredicates` and `RewritePredicateSubqueries`
since they are basically doing different parts of a same thing (and most
importantly, applying the same hack on `SubqueryExpression`'s `children`
field).
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