Github user viirya commented on the pull request: https://github.com/apache/spark/pull/11168#issuecomment-182895732 @hvanhovell there are two alternatives to match `tableProvider` rule: tableProvider tableOpts? (KW_AS selectStatementWithCTE)? And (LPAREN columnNameTypeList RPAREN)? (p=tableProvider?) ... Because `(LPAREN columnNameTypeList RPAREN)` is optional, an input `KW_USING Identifier` can be matched with both paths. So the warning is emitted and path 1 is chosen and path 2 is disabled. Actually it doesn't affect the functionality we need.
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