[jira] [Created] (FLINK-21283) Support sql extension for flink sql

[Shang Yuanchun (Jira)]

Jun Zhang created FLINK-21283:
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             Summary: Support sql extension for flink sql
                 Key: FLINK-21283
                 URL: https://issues.apache.org/jira/browse/FLINK-21283
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
    Affects Versions: 1.12.1
            Reporter: Jun Zhang
             Fix For: 1.13.0


I think we should add sql extension for flink sql so that users can customize sql parsing, sql optimization, etc. we can refer to [spark sql extension |https://issues.apache.org/jira/browse/SPARK-18127]



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