Optimize last message search in member list view

2020-06-13 02:45:06 +02:00 · 2020-06-13 02:45:06 +02:00 · 292676b694
commit 292676b694
parent d246c9bf33
1 changed files with 2 additions and 1 deletions
--- a/PluralKit.Core/Database/views.sql
+++ b/PluralKit.Core/Database/views.sql
@ -9,7 +9,8 @@ from systems
 create view member_list as
 select members.*,
       -- Find last message ID
-       (select max(messages.mid) from messages where messages.member = members.id) as last_message,
+       -- max(mid) does full table scan, order by/limit uses index (dunno why, but it works!)
+       (select mid from messages where messages.member = members.id order by mid desc nulls last limit 1) as last_message,
       
       -- Find last switch timestamp
       (