Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22561
Please describe the idea clearly in the PR description.
After reading the code, I think the idea is, for any predicate `p`, we can
rewrite it to `p'` that only contains partition columns. The requirement is,
partitions returned by the partition predicate `p`, must also be returned by
`p'`.
We need to be careful here, to not introduce correctness issues. Can you
prove that your rewrite is safe?
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