Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/3026#discussion_r97306096
--- 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)
--- End diff --
In order to reduce the code complexity, I think it is enough if we only
support the `grouping(...)` syntax.
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