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Posted to issues@flink.apache.org by "Lyn Zhang (Jira)" <ji...@apache.org> on 2021/10/11 10:00:18 UTC

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

     [ https://issues.apache.org/jira/browse/FLINK-24504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lyn Zhang updated FLINK-24504:
------------------------------
    Description: 
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.

  was:
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.


> 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
>            Priority: Major
>
> 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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