Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/14962
> the target metastore table exists and thus tableExists returns true, but
the following catalog.lookupRelation actually returns a temporary table.
Before this PR, yeah, it behaves the same. After this PR, we expect
`catalog.lookupRelation` returns a metastore table. However, it returns a
temporary table. Thus, we might misse the detection.
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