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Posted to issues@flink.apache.org by "Lyn Zhang (Jira)" <ji...@apache.org> on 2021/10/21 08:58:00 UTC

[jira] [Updated] (FLINK-24610) Flink projection common expression elimination

     [ https://issues.apache.org/jira/browse/FLINK-24610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lyn Zhang updated FLINK-24610:
------------------------------
    Description: 
Flink sql projection can not reuse common expression in runtime stage.

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

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

> Flink projection common expression elimination
> ----------------------------------------------
>
>                 Key: FLINK-24610
>                 URL: https://issues.apache.org/jira/browse/FLINK-24610
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Planner
>            Reporter: Lyn Zhang
>            Priority: Major
>
> Flink sql projection can not reuse common expression in runtime stage.
> For example the sql: SELECT split(a, '_'_)[1], split(a, '_'_)[2] FROM table.
> The function split(a, '_') will be invoked 2 times per row data,  We can improve it.



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