Github user mgaido91 commented on the issue:

    https://github.com/apache/spark/pull/20023
  
    @gatorsmile as far as I know, Hive implementation is consistent with MS SQL 
Server 2006 and the implementation is taken by the description of its behavior 
in MSDN blogs. DB2 implementation I think is not suitable for any big data 
system, since it is very likely to fail at runtime wasting a lot of 
computational time in big data applications.


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