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https://issues.apache.org/jira/browse/CALCITE-1581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16906962#comment-16906962
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Stamatis Zampetakis commented on CALCITE-1581:
----------------------------------------------

Hi [~Chunwei Lei], did you have the chance to review the PR? Will it make it in 
1.21.0?

> UDTF like in hive
> -----------------
>
>                 Key: CALCITE-1581
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1581
>             Project: Calcite
>          Issue Type: New Feature
>            Reporter: Xiaoyong Deng
>            Assignee: pengzhiwei
>            Priority: Major
>              Labels: pull-request-available, udtf
>             Fix For: 1.21.0
>
>          Time Spent: 3.5h
>  Remaining Estimate: 0h
>
> Support one row in and multi-column/multi-row out(one-to-many mapping), just 
> like udtf in hive.
> The query would like this:
> {code}
> select
>   func(c0, c1) as (f0, f1, f2)
> from table_name;
> {code}
> c0 and c1 are 'table_name' columns. f0, f1 and f2 are new generated columns.



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