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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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Flink Jira Bot updated FLINK-24610:
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Labels: auto-deprioritized-major pull-request-available (was:
pull-request-available stale-major)
Priority: Minor (was: Major)
This issue was labeled "stale-major" 7 days ago and has not received any
updates so it is being deprioritized. If this ticket is actually Major, please
raise the priority and ask a committer to assign you the issue or revive the
public discussion.
> 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
>
> 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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