Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/17520
Commit
https://github.com/apache/spark/pull/17520/commits/bc4fe9326e3c33954d223746ec36fb990fb8d994
is an initial work to demonstrate the idea of merging the 2-stage
transformation of [NOT] Exists/IN subquery into LeftSemi/LeftAnti. It has the
skeleton of the work but needs to fill in more details.
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