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

["Flink Jira Bot (Jira)" <ji...@apache.org>]

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

Flink Jira Bot updated FLINK-24610:
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    Labels: auto-deprioritized-major pull-request-available stale-minor  (was: auto-deprioritized-major pull-request-available)

I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help the community manage its development. I see this issues has been marked as Minor but is unassigned and neither itself nor its Sub-Tasks have been updated for 180 days. I have gone ahead and marked it "stale-minor". If this ticket is still Minor, please either assign yourself or give an update. Afterwards, please remove the label or in 7 days the issue will be deprioritized.


> 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: Minor
>              Labels: auto-deprioritized-major, pull-request-available, stale-minor
>
> Flink sql projection not support reusing common expression in code generator.
> 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 use CalcProgram.getExprList to generator each expression and CalcProgram.getProjectList to eliminate common expression.



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