Github user rxin commented on the pull request:

    https://github.com/apache/spark/pull/10541#issuecomment-168781095
  
    @liancheng 
    
    One thing about testing infrastructure: It is a good idea to use the 
existing Hive compatibility tests to bootstrap your test coverage. However, for 
every test failure that you find, we should create unit tests specifically 
built for the SQL conversion and increase the coverage of that. In the long 
run, we should not depend on the Hive compatibility tests.



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