General Error in board-wide feed with PostgreSQL (+patch)

General Error
SQL ERROR [ postgres ]

ERROR: invalid reference to FROM-clause entry for table "p" LINE 1: ...users u LEFT JOIN phpbb_forums f
ON (f.forum_id = p.forum_id... ^ HINT: There is an entry for table "p", but it cannot be referenced from
this part of the query. []

SQL

SELECT f.forum_id, f.forum_name, p.post_id, p.topic_id, p.post_time, p.post_subject, p.post_text,
p.bbcode_bitfield, p.bbcode_uid, p.enable_bbcode, p.enable_smilies, p.enable_magic_url, u.username,
u.user_id FROM phpbb_posts p, phpbb_users u LEFT JOIN phpbb_forums f ON (f.forum_id = p.forum_id)
WHERE p.topic_id = 1 AND (p.post_approved = 1 OR p.forum_id IN (1, 2)) AND p.post_time >= 1272112460
AND u.user_id = p.poster_id ORDER BY p.post_time DESC LIMIT 15 OFFSET 0

BACKTRACE

FILE: includes/db/postgres.php
LINE: 177
CALL: dbal->sql_error()

FILE: includes/db/postgres.php
LINE: 232
CALL: dbal_postgres->sql_query()

FILE: includes/db/dbal.php
LINE: 170
CALL: dbal_postgres->_sql_query_limit()

FILE: feed.php
LINE: 621
CALL: dbal->sql_query_limit()

FILE: feed.php
LINE: 78
CALL: phpbb_feed_base->get_item()