Github user jiangxb1987 commented on the issue:

    https://github.com/apache/spark/pull/15717
  
    @cloud-fan Could you explain more about the reason why we are not planning 
to support changing columns? It seems that implementing these statements are 
not very hard if we decide to follow the HIVE way(that only modifies the schema 
but not the data). And I believe these are really useful. Thanks!


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