Github user ericl commented on the issue:
https://github.com/apache/spark/pull/15673
For large tables, the degraded performance should be considered a bug as
well.
How about this.
1) If direct sql is disabled, log a warning about degraded performance with
this flag and fall back to fetching all partitions.
2) If direct sql is enabled, crash with a message suggesting to disable
filesource partition management and report a bug.
That way, we will know if there are cases where metastore pruning fails
with direct sql enabled.
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