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Posted to issues@calcite.apache.org by "Julian Hyde (Jira)" <ji...@apache.org> on 2022/10/27 00:33:00 UTC

[jira] [Assigned] (CALCITE-5268) Add QUALIFY clause

     [ https://issues.apache.org/jira/browse/CALCITE-5268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde reassigned CALCITE-5268:
------------------------------------

    Assignee: Brandon Chong

> Add QUALIFY clause
> ------------------
>
>                 Key: CALCITE-5268
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5268
>             Project: Calcite
>          Issue Type: New Feature
>            Reporter: Brandon Chong
>            Assignee: Brandon Chong
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> {{QUALIFY}} is to Window functions what {{HAVING}} is to {{GROUP BY}}.
> For example:
> {code}
> SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b ORDER BY c) as row_num
> FROM t1
> QUALIFY row_num = 1
> {code}
> Is the same as:
> {code}
> SELECT *
> FROM (
>     SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b ORDER BY c) as row_num
>     FROM t1)
> WHERE row_num = 1
> {code}



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