Github user ericl commented on the issue:
https://github.com/apache/spark/pull/16514
Do you know why this check in the relation cache that the root paths have
not changed is not sufficient?
https://github.com/apache/spark/blob/24482858e05bea84cacb41c62be0a9aaa33897ee/sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala#L160
Seems SET LOCATION should cause that to change, causing the next cache get
to invalidate the relation.
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