Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/2816#issuecomment-59304994
FYI, following URL shows BNF of SQL99.
savage.net.au/SQL/sql-99.bnf.html
By the way, I think, BNF of Spark SQL and semantic analysis is little bit
different from Standard SQL.
The point I mentioned in this PR is one of those difference.
I'd like to refine BNF of Spark SQL in another PR.
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