Github user maropu commented on the issue:

    https://github.com/apache/spark/pull/18375
  
    @gatorsmile I remembered @liancheng said `we want to allow users to create 
partitioned tables that allow data schema to contain (part of) the partition 
columns, and there are test cases for this use case` before 
(https://github.com/apache/spark/pull/16030#issuecomment-263981907). But, I 
feel the query in the description seems to be error-prone, so how about just 
printing warning messages when detecting the duplication ([like 
here)](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/Column.scala#L264)?


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