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https://issues.apache.org/jira/browse/FLINK-10956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694759#comment-16694759
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Hequn Cheng commented on FLINK-10956:
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[~twalthr] Done. Thanks for the reminder.
> Reuse same rexCall during codegen
> ---------------------------------
>
> Key: FLINK-10956
> URL: https://issues.apache.org/jira/browse/FLINK-10956
> Project: Flink
> Issue Type: Improvement
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
>
> Currently, same rexCalls have not been reused during codegen. I think we can
> add some reuse logic to achieve a better performance. Take the following
> query as an example:
> {code:java}
> t.select(func0('c), func0('c), func0('c))
> {code}
> func0('c) is called three times for every input row even func0 is
> deterministic. It would be nice if we can reuse it.
> Any suggestions are appreciated.
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