optimized query for label counters

include/functions.php

@@ -1557,13 +1557,10 @@
 
 		$owner_uid = $_SESSION["uid"];
 
-		$result = db_query("SELECT id,caption,COUNT(u1.unread) AS unread,COUNT(u2.unread) AS total
+		$result = db_query("SELECT id,caption,SUM(CASE WHEN u1.unread = true THEN 1 ELSE 0 END) AS unread, COUNT(u1.unread) AS total
 			FROM ttrss_labels2 LEFT JOIN ttrss_user_labels2 ON
 				(ttrss_labels2.id = label_id)
-				LEFT JOIN ttrss_user_entries AS u1 ON (u1.ref_id = article_id AND u1.unread = true
+				LEFT JOIN ttrss_user_entries AS u1 ON u1.ref_id = article_id
-					AND u1.owner_uid = $owner_uid)
-				LEFT JOIN ttrss_user_entries AS u2 ON (u2.ref_id = article_id AND u2.unread = false
-					AND u2.owner_uid = $owner_uid)
 				WHERE ttrss_labels2.owner_uid = $owner_uid GROUP BY ttrss_labels2.id,
 					ttrss_labels2.caption");