Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/14712
a high-level question: Looks like the current design depends on some
features of hive metastore, e.g. the `STATS_GENERATED_VIA_STATS_TASK` flag. Is
it possible that we just treat hive metastore as a persistent level? So that
the statistics can still work if Spark SQL has its own metastore in the future.
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