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https://issues.apache.org/jira/browse/CALCITE-2754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16810473#comment-16810473
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Haisheng Yuan commented on CALCITE-2754:
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Pushed to master 
https://github.com/apache/calcite/commit/bb4a0638260b6103994b14e1071eb679ae4bb5c2,
 thanks for the PR, [~Sergey Nuyanzin] and [~Chunwei Lei]!

> LISTAGG support
> ---------------
>
>                 Key: CALCITE-2754
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2754
>             Project: Calcite
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 1.18.0
>            Reporter: Sergey Nuyanzin
>            Assignee: Chunwei Lei
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.20.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Inspired by CALCITE-2224.
> There is an implementation of LISTAGG mentioned in description of CALCITE-2224
> Unfortunately there is no info about LISTAGG in public available SQL:2016 
> draft at [1] while there is some description about LISTAGG as feature T625 
> e.g.at [2]
> [1] http://jtc1sc32.org/doc/N2551-2600/32N2572T-text_for_ballot-DIS_9075-2.pdf
> [2] https://modern-sql.com/feature/listagg



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