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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:
-----------------------------------
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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