cloud-fan commented on a change in pull request #23057: [SPARK-26078][SQL]
Dedup self-join attributes on IN subqueries
URL: https://github.com/apache/spark/pull/23057#discussion_r240606988
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
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@@ -92,18 +114,20 @@ object RewritePredicateSubquery extends Rule[LogicalPlan]
with PredicateHelper {
// Deduplicate conflicting attributes if any.
dedupJoin(Join(outerPlan, sub, LeftAnti, joinCond))
Review comment:
`dedupJoin` will evetually dedup the subquery IIUC.
What I'd like to do is to unify `dedupJoin` and `dedupSubqueryOnSelfJoin`,
so that the code will be consistent for all cases:
```
val newSub = dedup(sub, values)
// create join condition if any
Join(outerPlan, newSub, ...)
```
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