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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