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https://issues.apache.org/jira/browse/CALCITE-3994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17106583#comment-17106583
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Julian Hyde commented on CALCITE-3994:
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Why is this not a job for constant reduction?
> RexSimplify reduce concat calls with constant arguments
> -------------------------------------------------------
>
> Key: CALCITE-3994
> URL: https://issues.apache.org/jira/browse/CALCITE-3994
> Project: Calcite
> Issue Type: Improvement
> Affects Versions: 1.21.0
> Reporter: Jess Balint
> Priority: Minor
>
> would be good to implement support for string concat in RexSimplify
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