Github user dongjoon-hyun commented on the issue:

    https://github.com/apache/spark/pull/14132
  
    Hi, @rxin and @gatorsmile .
    Now, it's ready for review again.
    - `SubstituteHints` is minimized.
    - `MetastoreRelation` is supported.
      - This PR originally handles all the tables because it handle 
`UnresolvedRelation`. While trying to support `database` name, there occurs 
regression as @gatorsmile mentioned. Now, it's rollbacked. Hive 
`MetastoreRelation` is not in `catalyst` package. We should do this for 
`UnresolvedRelation`.
    - All the existing testcases passed. And, Hive specific testsuite is added.



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