Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4046#discussion_r120755990
--- Diff: docs/dev/table/sql.md ---
@@ -217,7 +444,7 @@ Group windows are defined in the `GROUP BY` clause of a
SQL query. Just like que
</tbody>
</table>
-For SQL queries on streaming tables, the `time_attr` argument of the group
window function must be one of the `rowtime()` or `proctime()` time-indicators,
which distinguish between event or processing time, respectively. For SQL on
batch tables, the `time_attr` argument of the group window function must be an
attribute of type `TIMESTAMP`.
+For SQL queries on streaming tables, the `time_attr` argument of the group
window function must refer to the virtual column that specifies the processing
time or the event time. For SQL on batch tables, the `time_attr` argument of
the group window function must be an attribute of type `TIMESTAMP`.
--- End diff --
Add a link to the time attribute section on the Table API Streaming doc
page.
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