IF in forum SQL not supported by postgresql

postgresql 7.4.5 / drupal 4.5.1

forum module version information:
// $Id: forum.module,v 1.217 2004/11/24 22:56:21 dries Exp $

in the forum module, the IF statement in the SQL queries is not postgresql compliant:
IF(l.last_comment_uid, cu.name, l.last_comment_name) as last_comment_name

needs to be a case statement (or an IF function in postgresql could be written...):
CASE WHEN l.last_comment_uid = 1 THEN cu.name ELSE l.last_comment_name END as last_comment_name

case statements are supported by both mySQL and postgresql...

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IF results in errors:
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warning: pg_query(): Query failed: ERROR: invalid input syntax for type boolean: "13" in /usr/local/apache/htdocs/includes/database.pgsql.inc on line 45.

user error:
query: SELECT DISTINCT(n.nid), l.last_comment_timestamp, IF(l.last_comment_uid, cu.name, l.last_comment_name) as last_comment_name, l.last_comment_uid FROM node n , node_comment_statistics l, users cu, term_node r WHERE n.nid = r.nid AND r.tid = 354 AND n.status = 1 AND n.type = 'forum' AND l.last_comment_uid = cu.uid AND n.nid = l.nid AND '1' ORDER BY l.last_comment_timestamp DESC LIMIT 1 OFFSET 0 in /usr/local/apache/htdocs/includes/database.pgsql.inc on line 62.

warning: pg_query(): Query failed: ERROR: invalid input syntax for type boolean: "2" in /usr/local/apache/htdocs/includes/database.pgsql.inc on line 45.

user error:
query: SELECT DISTINCT(n.nid), l.last_comment_timestamp, IF(l.last_comment_uid, cu.name, l.last_comment_name) as last_comment_name, l.last_comment_uid FROM node n , node_comment_statistics l, users cu, term_node r WHERE n.nid = r.nid AND r.tid = 353 AND n.status = 1 AND n.type = 'forum' AND l.last_comment_uid = cu.uid AND n.nid = l.nid AND '1' ORDER BY l.last_comment_timestamp DESC LIMIT 1 OFFSET 0 in /usr/local/apache/htdocs/includes/database.pgsql.inc on line 62.

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suggested patch:
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function forum_get_forums($tid = 0) { // ~at around line 380:
// remove:
-- $topic = db_fetch_object(db_query_range('SELECT DISTINCT(n.nid), l.last_comment_timestamp, IF(l.last_comment_uid, cu.name, l.last_comment_name) as last_comment_name, l.last_comment_uid FROM {node} n ' . node_access_join_sql() . ", {node_comment_statistics} l /*! USE INDEX (node_comment_timestamp) */, {users} cu, {term_node} r WHERE n.nid = r.nid AND r.tid = %d AND n.status = 1 AND n.type = 'forum' AND l.last_comment_uid = cu.uid AND n.nid = l.nid AND " . node_access_where_sql() . ' ORDER BY l.last_comment_timestamp DESC', $forum->tid, 0, 1));

// add:
++ $topic = db_fetch_object(db_query_range('SELECT DISTINCT(n.nid), l.last_comment_timestamp, CASE WHEN l.last_comment_uid = 1 THEN cu.name ELSE l.last_comment_name END as last_comment_name, l.last_comment_uid FROM {node} n ' . node_access_join_sql() . ", {node_comment_statistics} l, {users} cu, {term_node} r WHERE n.nid = r.nid AND r.tid = %d AND n.status = 1 AND n.type = 'forum' AND l.last_comment_uid = cu.uid AND n.nid = l.nid AND " . node_access_where_sql() . ' ORDER BY l.last_comment_timestamp DESC', $forum->tid, 0, 1));

function _forum_topics_read($term, $uid) { // ~at around line 420:
// remove:
-- $sql = "SELECT DISTINCT(n.nid), f.tid, n.title, n.sticky, u.name, u.uid, n.created AS timestamp, n.comment AS comment_mode, l.last_comment_timestamp, IF(l.last_comment_uid, cu.name, l.last_comment_name) as last_comment_name, l.last_comment_uid, l.comment_count AS num_comments FROM {node} n ". node_access_join_sql() .", {node_comment_statistics} l, {users} cu, {term_node} r, {users} u, {forum} f WHERE n.status = 1 AND l.last_comment_uid = cu.uid AND n.nid = l.nid AND n.nid = r.nid AND r.tid = $check_tid AND n.uid = u.uid AND n.nid = f.nid AND ". node_access_where_sql();
$sql .= tablesort_sql($forum_topic_list_header, 'n.sticky DESC,');

// add:
++ $sql = "SELECT DISTINCT(n.nid), f.tid, n.title, n.sticky, u.name, u.uid, n.created AS timestamp, n.comment AS comment_mode, l.last_comment_timestamp, CASE WHEN l.last_comment_uid = 1 THEN cu.name ELSE l.last_comment_name END as last_comment_name, l.last_comment_uid, l.comment_count AS num_comments FROM {node} n ". node_access_join_sql() .", {node_comment_statistics} l, {users} cu, {term_node} r, {users} u, {forum} f WHERE n.status = 1 AND l.last_comment_uid = cu.uid AND n.nid = l.nid AND n.nid = r.nid AND r.tid = $check_tid AND n.uid = u.uid AND n.nid = f.nid AND ". node_access_where_sql();
$sql .= tablesort_sql($forum_topic_list_header, 'n.sticky DESC,');