Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/11297#discussion_r56101451
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1169,6 +1170,7 @@ object PushPredicateThroughJoin extends
Rule[LogicalPlan] with PredicateHelper {
Join(newLeft, newRight, LeftOuter, newJoinCond)
case FullOuter => f
case NaturalJoin(_) => sys.error("Untransformed NaturalJoin node")
+ case UsingJoin(_, _) => sys.error("Untransformed Using join node")
--- End diff --
JoinType is sealed, so we need to put something in this pattern match
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