Github user mallman commented on the issue:
https://github.com/apache/spark/pull/14690
I've rebased this PR and refactored it somewhat. The main change is to move
the partition pruning logic from `FileSourceStrategy` into a Catalyst optimizer
rule called `PruneFileSourcePartitions`. I've updated the PR's description to
provide a rationale for the new approach, but the basic gist is to move
partition pruning earlier in query planning to allow its effects to be more
visible in the query plan, both internally to the planner and externally in the
textual representation of the query plan.
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