Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10762#discussion_r50803405
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -474,6 +474,7 @@ class DataFrame private[sql](
val rightCol =
withPlan(joined.right).resolve(col).toAttribute.withNullability(true)
Alias(Coalesce(Seq(leftCol, rightCol)), col)()
}
+ case NaturalJoin(_) => sys.error("NaturalJoin with using clause is
not supported.")
--- End diff --
Then this case is unreachable as `JoinType.apply` won't produce natural
join.
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