Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/14132#discussion_r70884912
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -945,8 +955,12 @@ SIMPLE_COMMENT
: '--' ~[\r\n]* '\r'? '\n'? -> channel(HIDDEN)
;
+BRACKETED_EMPTY_COMMENT
--- End diff --
Oops. It seems we can not do that due to `channel(HIDDEN)`.
```
->command in lexer rule BRACKETED_COMMENT must be last element of single
outermost alt
```
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