Github user Tagar commented on the issue:
https://github.com/apache/spark/pull/16228
2. That is great. Would it be easier to use FK, when it is available (see
HMS has FKs since Hive 2.1: https://issues.apache.org/jira/browse/HIVE-13076),
and if FK between columns is not defined, then use stats.
Also, do I understand correctly, that the assumption is if two tables being
joined by columns with the same name, join columns have the same stats / set of
values?
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