[jira] [Created] (FLINK-26053) Fix parser generator warnings

["Francesco Guardiani (Jira)" <ji...@apache.org>]

Francesco Guardiani created FLINK-26053:
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             Summary: Fix parser generator warnings
                 Key: FLINK-26053
                 URL: https://issues.apache.org/jira/browse/FLINK-26053
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
            Reporter: Francesco Guardiani


When building flink-sql-parser, the javacc logs a couple of warnings:


{code}
Warning: Choice conflict in [...] construct at line 2920, column 5.
         Expansion nested within construct and expansion following construct
         have common prefixes, one of which is: "PLAN"
         Consider using a lookahead of 2 or more for nested expansion.
Warning: Choice conflict involving two expansions at
         line 2930, column 9 and line 2932, column 9 respectively.
         A common prefix is: "STATEMENT"
         Consider using a lookahead of 2 for earlier expansion.
Warning: Choice conflict involving two expansions at
         line 2952, column 9 and line 2954, column 9 respectively.
         A common prefix is: "STATEMENT"
         Consider using a lookahead of 2 for earlier expansion.
{code}

Took from https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=30871&view=logs&j=0c940707-2659-5648-cbe6-a1ad63045f0a&t=075c2716-8010-5565-fe08-3c4bb45824a4&l=3911

We should investigate them, as they're often symptom of some bug in our parser template, which might result in unexpected parsing errors.



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