Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/4842#discussion_r145253439
--- Diff: docs/dev/table/tableApi.md ---
@@ -574,6 +574,7 @@ Table result = orders
</td>
<td>
<p>Joins a table with a the results of a table function. Each row
of the left (outer) table is joined with all rows produced by the corresponding
call of the table function. If a table function call returns an empty result,
the corresponding outer row is preserved and the result padded with null values.
+ <p><b>Note:</b> Currently the predicates for table function left
outer join can only be empty or literal <code>true</code>.</p>
--- End diff --
-> `Currently, the predicate of a table function left outer join can only
be empty or literal <code>true</code>.`
---
