Github user ericl commented on the issue:
https://github.com/apache/spark/pull/14690
@cloud-fan if an external catalog supports pruning, we shouldn't try to
materialize it in memory, since the catalog can probably do a better job of
caching and pruning than we can. Currently you can only get this behavior with
un-converted hive tables + hive partition pruning flag enabled, which is
necessary to get reasonable analysis time for small queries over tables with
many partitions.
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