Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14580
@dongjoon-hyun The root cause is not in the optimizer rule
`EliminateOuterJoin`. Your fix will reduce the chances we can eliminate the
outer-join. This is not a right fix. The existing way we handle `using joins`
might also break the other Optimizer rules.
@nsyca Thank you for your inputs. DB2 does not have such a join type (using
+ outer), based on my understanding, right?
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