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From twalthr <...@git.apache.org>
Subject [GitHub] flink pull request #3026: [FLINK-2980] [table] Support for GROUPING SETS cla...
Date Mon, 23 Jan 2017 14:13:13 GMT
Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3026#discussion_r97298700
  
    --- Diff: docs/dev/table_api.md ---
    @@ -790,6 +790,40 @@ val result = in.groupBy('a).select('a, 'b.sum as 'd);
         </tr>
     
         <tr>
    +      <td><strong>GroupingSets</strong></td>
    +      <td>
    +        <p>Similar to a SQL GROUP BY GROUPING SETS clause. A GROUPING SETS expression
allows to selectively specify the
    +        set of groups that you want to create within a GROUP BY clause.</p>
    +{% highlight scala %}
    +val in = ds.toTable(tableEnv, 'a, 'b, 'c);
    +val result = in.groupingSets(('a, 'b), 'b, ()).select('a, 'b, 'c.sum as 'd);
    +{% endhighlight %}
    +      </td>
    +    </tr>
    +
    +    <tr>
    +      <td><strong>Cube</strong></td>
    +      <td>
    +        <p>Similar to a SQL GROUP BY CUBE clause. A CUBE expression will generate
subtotals for all combinations of the dimensions specified.</p>
    --- End diff --
    
    Would be great if you could also add an example. E.g. `.cube('a, 'b)` is equivalent to
`.groupingSets(...)`.


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