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https://issues.apache.org/jira/browse/FLINK-24504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lyn Zhang updated FLINK-24504:
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Description:
Flink sql user define function 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, 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
> Labels: pull-request-available
>
> Flink sql user define function 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, We can improve it.
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