Github user dongjoon-hyun commented on the issue:

    https://github.com/apache/spark/pull/15987
  
    Hi, @hvanhovell .
    Could you review this PR?
    
    This is the first attempt to use `UnresolvedAttribute` and Analyzer rule. 
There are two debatable issues.
    
    - Catalyst Analyzer doesn't know `AlterTableDropPartitions`, so I need to 
introduce `CommandWithExpression` trait here.
    
    - I added a testcase for atomic types, but we need to change `ADD 
PARTITION`, too. `ADD PARTITION` relates the several more parts. If possible, I 
want to make them as a separate PR.


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