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https://issues.apache.org/jira/browse/FLINK-24610?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lyn Zhang updated FLINK-24610:
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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. Eliminate
common expression by calcite.
was:
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
> Labels: pull-request-available
>
> 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. Eliminate
> common expression by calcite.
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