Two Left Joins = Connection Reset Error

[eluser]vbrtrmn[/eluser]
I've got a query which I use two left joins and several inner joins, it consistently returns a connection reset error in firefox and no error message in the apache logs.

If I remove the 'left' arguments the same error does not occur, if I run the SQL from $this->db->last_query() directly in the DB adding the LEFT joins back in, it comes back properly (either in phpMyAdmin or commandline).

The "inner" arguments don't need to be passed, I put them in there to experiment.

Code:

$this->db->select('votes.uid AS voterUID, comments.uid AS voteeUID, voteTypes.id AS voteTypeID, userratingVoter.level AS voterLevel, userratingVotee.level AS voteeLevel');

$this->db->from('votes');

# Join the comments table on comments.id = votes.cid
$this->db->join('comments', 'comments.id = votes.cid', 'inner');

# Join the userauth table for admin WHERE clause below
$this->db->join('userauth',  'userauth.uid = votes.uid', 'inner');

# Join the votesTypes table for the WHERE IN clause below
$this->db->join('voteTypes', 'voteTypes.id = votes.voteid', 'inner');

# Join the userrating table twice once for the Voter once for the Votee
$this->db->join('userrating AS userratingVotee', 'userratingVotee.uid = comments.uid', 'left');
$this->db->join('userrating AS userratingVoter', 'userratingVoter.uid = votes.uid', 'left');

# Where in valid Vote Types
# Valid Vote Types: helpful, interesting, correct, incorrect
#                   5        4            2        7
$validVoteTypes = array(5,4,2,7);
$this->db->where_in('votes.voteid', $validVoteTypes);

# Where vote is active.
$this->db->where('votes.active',1);

# Where timestamp is greater than the last run timestamp.
$this->db->where('votes.timestamp >',$lastrun);

# Only standard user votes count, may have to update this if we get other authids
$this->db->where('userauth.authid',2);

Broken up SQL from $this->db->last_query()... works in phpMyAdmin and from commandline.

Code:

SELECT `votes`.`uid` AS voterUID, `comments`.`uid` AS voteeUID, `voteTypes`.`id` AS voteTypeID, `userratingVoter`.`level` AS voterLevel, `userratingVotee`.`level` AS voteeLevel

FROM (`votes`)

INNER JOIN `comments` ON `comments`.`id` = `votes`.`cid`
INNER JOIN `userauth` ON `userauth`.`uid` = `votes`.`uid`
INNER JOIN `voteTypes` ON `voteTypes`.`id` = `votes`.`voteid`

LEFT JOIN `userrating` AS userratingVotee ON `userratingVotee`.`uid` = `comments`.`uid`
LEFT JOIN `userrating` AS userratingVoter ON `userratingVoter`.`uid` = `votes`.`uid`

WHERE `votes`.`voteid` IN (5, 4, 2, 7)
AND `votes`.`active` = 1
AND `votes`.`timestamp` > '2012-03-01 00:00:00'
AND `userauth`.`authid` = 2

Further if I use a standard query instead of the active record syntax, it produces the same results.

Code:

$sql = "SELECT `votes`.`uid` AS voterUID, `comments`.`uid` AS voteeUID, `voteTypes`.`id` AS voteTypeID, `userratingVoter`.`level` AS voterLevel, `userratingVotee`.`level` AS voteeLevel FROM (`votes`) INNER JOIN `comments` ON `comments`.`id` = `votes`.`cid` INNER JOIN `userauth` ON `userauth`.`uid` = `votes`.`uid` INNER JOIN `voteTypes` ON `voteTypes`.`id` = `votes`.`voteid` LEFT JOIN `userrating` AS userratingVotee ON `userratingVotee`.`uid` = `comments`.`uid` LEFT JOIN `userrating` AS userratingVoter ON `userratingVoter`.`uid` = `votes`.`uid` WHERE `votes`.`voteid` IN (5, 4, 2, 7) AND `votes`.`active` = 1 AND `votes`.`timestamp` > '2012-03-01 00:00:00' AND `userauth`.`authid` = 2";

$query = $this->db->query($sql);

If I use a standard JOIN instead of LEFT JOIN for either the error does not occur, though it doesn't return the data I need.

Server Info:

Apache/2.2.14 (Ubuntu)
PHP/5.3.2
MySQL 5.1.63
CodeIgniter 2.1.2

application/config/database.php

Code:

$active_group = 'default';
$active_record = TRUE;

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'some_user';
$db['default']['password'] = 'some_pass';
$db['default']['database'] = 'some_db';
$db['default']['dbdriver'] = 'mysqli';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;