sunjincheng121 commented on a change in pull request #6949:
[FLINK-10676][table] Add 'as' method for OverWindowWithOrderBy
URL: https://github.com/apache/flink/pull/6949#discussion_r231500525
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File path: docs/dev/table/tableApi.md
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@@ -1571,13 +1571,15 @@ The `OverWindow` defines a range of rows over which
aggregates are computed. `Ov
</tr>
<tr>
<td><code>preceding</code></td>
- <td>Required</td>
+ <td>Optional</td>
<td>
<p>Defines the interval of rows that are included in the window and
precede the current row. The interval can either be specified as time or
row-count interval.</p>
<p><a href="tableApi.html#bounded-over-windows">Bounded over
windows</a> are specified with the size of the interval, e.g.,
<code>10.minutes</code> for a time interval or <code>10.rows</code> for a
row-count interval.</p>
<p><a href="tableApi.html#unbounded-over-windows">Unbounded over
windows</a> are specified using a constant, i.e., <code>UNBOUNDED_RANGE</code>
for a time interval or <code>UNBOUNDED_ROW</code> for a row-count interval.
Unbounded over windows start with the first row of a partition.</p>
+
+ <p>If the <code>preceding</code> and <code>following</code> clause
both are omitted, RANGE UNBOUNDED PRECEDING AND CURRENT ROW is used as default
for window.</p>
Review comment:
UNBOUNDED_RANGE and CURRENT_RANGE appear in pairs，So the following
description is recommended:
If the preceding clause is omitted, UNBOUNDED_RANGE and CURRENT_RANGE is
used as default for window. What do you think?
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