Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4404#discussion_r131633926
--- Diff: docs/dev/table/sql.md ---
@@ -497,6 +497,23 @@ FROM (
{% endhighlight %}
</td>
</tr>
+
+ <tr>
+ <td>
+ <strong>In</strong><br>
+ <span class="label label-primary">Batch</span>
+ </td>
+ <td>
+ Returns true if an expression exists in a given table sub-query. The
sub-query table must consist of one column. This column must have the same data
type as the expression.
--- End diff --
What do you mean with "enhanced"? We cannot change the SQL standard. The
user can nest another query and reduce the table to one column.
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