Github user aokolnychyi commented on the issue:
https://github.com/apache/spark/pull/18692
@SimonBin The initial solution handled your case but then there was a
decision to restrict the proposed rule to cross joins only. You can find the
reason in this
[comment](https://github.com/apache/spark/pull/18692#issuecomment-326694822) or
in the code.
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