Fix error 1055 in MySQL 5.7 (sql_mode=only_full_group_by)

Author: svivian

qa-include/db/hotness.php

@@ -61,7 +61,7 @@ function qa_db_hotness_update($firstpostid, $lastpostid = null, $viewincrement =
 	if (!isset($lastpostid))
 		$lastpostid = $firstpostid;
 
-	$query = "UPDATE ^posts AS x, (SELECT parents.postid, parents.created AS qcreated, COALESCE(MAX(children.created), parents.created) as acreated, children.acount, parents.netvotes, parents.views FROM ^posts AS parents LEFT JOIN ^posts AS children ON parents.postid=children.parentid AND children.type='A' WHERE parents.postid BETWEEN # AND # GROUP BY postid) AS a SET x.hotness=(" .
+	$query = "UPDATE ^posts AS x, (SELECT parents.postid, parents.created AS qcreated, COALESCE(MAX(children.created), parents.created) as acreated, COUNT(children.postid) AS acount, parents.netvotes, parents.views FROM ^posts AS parents LEFT JOIN ^posts AS children ON parents.postid=children.parentid AND children.type='A' WHERE parents.postid BETWEEN # AND # GROUP BY postid) AS a SET x.hotness=(" .
 		'((TO_DAYS(a.qcreated)-734138)*86400.0+TIME_TO_SEC(a.qcreated))*# + ' . // zero-point is Jan 1, 2010
 		'((TO_DAYS(a.acreated)-734138)*86400.0+TIME_TO_SEC(a.acreated))*# + ' .
 		'(a.acount+0.0)*# + ' .