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https://issues.apache.org/jira/browse/FLINK-24610?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434275#comment-17434275
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Lyn Zhang commented on FLINK-24610:
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[~jark] Please help to review this issue if you are free
> 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 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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