yeshengm commented on a change in pull request #25164: [SPARK-28375][SQL]
Prevent the PullupCorrelatedPredicates optimizer rule from removing predicates
if run multiple times
URL: https://github.com/apache/spark/pull/25164#discussion_r304766364
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
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@@ -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:
TBH subquery resolution and optimzation are super tricky and can be
error-prone. The current code is a bit complex and fragile, because one piece
of code might have some pre-conditions on some other part of the codebase,
which might change over time.
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