Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14580
That is a public API. We are unable to remove it.
https://github.com/apache/spark/pull/8600 has a serious bug. It has been fixed
in another PR: https://github.com/apache/spark/pull/10353.
Now, the issue is how to deal with using/natural outer join. Maybe we can
introduce new join types. Or, in the rule, we can find a hacky way to know
whether this outer join is nature/using joins.
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