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Posted to dev@flink.apache.org by "Lyn Zhang (Jira)" <ji...@apache.org> on 2021/10/11 09:59:00 UTC

[jira] [Created] (FLINK-24504) Flink udf common expression elimination

Lyn Zhang created FLINK-24504:
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             Summary: Flink udf common expression elimination
                 Key: FLINK-24504
                 URL: https://issues.apache.org/jira/browse/FLINK-24504
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
    Affects Versions: 1.14.0
            Reporter: Lyn Zhang


Flink sql user define function can not reuse common expression.

For example the sql: SELECT split(a, '_')[1], split(a, '_')[2] FROM table.

The function split(a, '_') will be invoked 2 times,  We can improve it.



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