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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