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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2980) Add CUBE/ROLLUP/GROUPING SETS operator in Table API.
Date Mon, 23 Jan 2017 14:13:28 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834607#comment-15834607
] 

ASF GitHub Bot commented on FLINK-2980:
---------------------------------------

Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3026#discussion_r97305200
  
    --- Diff: docs/dev/table_api.md ---
    @@ -2714,6 +2748,42 @@ ARRAY.element()
           </td>
         </tr>
     
    +    <tr>
    +      <td>
    +        {% highlight scala %}
    +groupId()
    +{% endhighlight %}
    +      </td>
    +      <td>
    +        <p>Returns an integer that uniquely identifies the combination of grouping
keys.</p>
    +      </td>
    +    </tr>
    +
    +    <tr>
    +      <td>
    +        {% highlight scala %}
    +ANY.grouping()
    +grouping(ANY)
    +{% endhighlight %}
    +      </td>
    +      <td>
    +        <p>Returns 1 if expression is rolled up in the current row’s grouping
set, 0 otherwise.</p>
    +      </td>
    +    </tr>
    +
    +    <tr>
    +      <td>
    +        {% highlight scala %}
    +ANY.groupingId()
    +(ANY [, ANY ]*).groupingId()
    +groupingId(ANY [, ANY ]*)
    +{% endhighlight %}
    +      </td>
    +      <td>
    +        <p>Returns a bit vector of the given grouping expressions.</p>
    +      </td>
    +    </tr>
    +
    --- End diff --
    
    Add the same documentation to the Java section.


> Add CUBE/ROLLUP/GROUPING SETS operator in Table API.
> ----------------------------------------------------
>
>                 Key: FLINK-2980
>                 URL: https://issues.apache.org/jira/browse/FLINK-2980
>             Project: Flink
>          Issue Type: New Feature
>          Components: Documentation, Table API & SQL
>            Reporter: Chengxiang Li
>            Assignee: Alexander Chermenin
>         Attachments: Cube-Rollup-GroupSet design doc in Flink.pdf
>
>
> Computing aggregates over a cube/rollup/grouping sets of several dimensions is a common
operation in data warehousing. It would be nice to have them in Table API.



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