Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12954#discussion_r62377447
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1645,3 +1646,30 @@ object RewriteCorrelatedScalarSubquery extends
Rule[LogicalPlan] {
}
}
}
+
+/**
+ * Rewrite [[Filter]] plans that contain correlated [[ScalarSubquery]]
expressions. When these
+ * correlated [[ScalarSubquery]] expressions are wrapped in a some
Predicate expression, we rewrite
+ * them into [[PredicateSubquery]] expressions.
+ */
+object RewriteScalarSubqueriesInFilter extends Rule[LogicalPlan] {
--- End diff --
This rule is not necessary for this fix, right?
Also, we have a rule to turn outer join into semi join if possible, does
that one not work in case?
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