Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/15717
  
    https://issues.apache.org/jira/browse/SPARK-18727 is a related JIRA. If we 
allow users to manually change the schema, do we need to follow what Hive does 
now?  ALTER TABLE ADD/REPLACE/CHANGE COLUMN? 
    
    BTW, to support these DDL, it might also impact the new view management.


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