Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3964#issuecomment-69591277
@scwf, I can understand we need to make it compatible with the TPC-DC.
In SQL Server 2008, I found the format you suggested is one of the
variances:
http://technet.microsoft.com/en-us/library/bb522631(v=sql.105).aspx
In MySQL, seems it works in the way of Hive does:
http://dev.mysql.com/doc/refman/5.6/en/group-by-modifiers.html
And both variances are the subset of SQL 99 spec's, I don't mind which
format is supported first, and we can add the other later on.
@marmbrus , not sure if you have any concerns on what the specs that we
should follow for SQLContext parser.
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