Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/10731#issuecomment-197727832
Just did a quick search.
> SQL92 allowed the use of ordinal positions for sort_expressions, but this
functionality has been deprecated and should not be used in SQL2003 queries.
However, the mainstream RDBMS still support it.
- Oracle:
https://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_10002.htm#i2171079
- DB2:
https://www.ibm.com/support/knowledgecenter/SSEPEK_10.0.0/com.ibm.db2z10.doc.sqlref/src/tpc/db2z_sql_orderbyclause.dita
- SQL Server: https://msdn.microsoft.com/en-us/library/ms188385.aspx
None of these top 3 enterprise RDBMS are allowing negative positions. I
think we should not support the negative integer in Order by.
Thanks!
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