Github user gengliangwang commented on the issue:
https://github.com/apache/spark/pull/19855
I think for
```
This PR also fix a bug in predicate subquery push down through join (they
should not).
```
he meant here:
https://github.com/apache/spark/pull/12820/files#diff-a636a87d8843eeccca90140be91d4fafR1213
But I don't know why @davies moved the rule to the end, either.
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