[jira] [Created] (SPARK-30431) Update SqlBase.g4 to create commentSpec pattern as same as locationSpec

["Kent Yao (Jira)" <ji...@apache.org>]

Kent Yao created SPARK-30431:
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             Summary: Update SqlBase.g4 to create commentSpec pattern as same as locationSpec
                 Key: SPARK-30431
                 URL: https://issues.apache.org/jira/browse/SPARK-30431
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Kent Yao


In `SqlBase.g4`, the comment clause is used as `COMMENT comment=STRING` and `COMMENT STRING` in many places.

While the location clause often appears along with the comment clause with a pattern defined as 

{code:sql}
locationSpec
    : LOCATION STRING
    ;
{code}

Then, we have to visit locationSpec as a List but comment as a single token




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