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Posted to issues@calcite.apache.org by "Hongze Zhang (JIRA)" <ji...@apache.org> on 2019/02/13 12:26:00 UTC

[jira] [Created] (CALCITE-2847) Optimize global LOOKAHEAD for SQL parsers

Hongze Zhang created CALCITE-2847:
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             Summary: Optimize global LOOKAHEAD for SQL parsers
                 Key: CALCITE-2847
                 URL: https://issues.apache.org/jira/browse/CALCITE-2847
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Hongze Zhang
            Assignee: Julian Hyde


Currently global LOOKAHEAD is set to 2 for the built-in SQL parsers[1], we'd like to optimize LOOKAHEAD to 1 to enable performance enhancement if possible.



[1]https://github.com/apache/calcite/blob/883666929478aabe07ee5b9e572c43a6f1a703e2/core/pom.xml#L304



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