QUERY PLAN
Aggregate (cost=25512.82..25512.83 rows=1 width=8)
-> Sort (cost=24884.57..24989.28 rows=41883 width=248)
Sort Key: (CASE WHEN ((c.created_by = 1001) OR uc.is_read) THEN true ELSE false END), c.created_at DESC
-> Hash Right Join (cost=10071.77..16800.70 rows=41883 width=248)
Hash Cond: (uc.comment_id = c.id)
Filter: ((uc.remind_user_id = 1001) OR (c.created_by = 1001))
-> Seq Scan on tbl_unread_comments uc (cost=0.00..5241.15 rows=40406 width=9)
Filter: (remind_user_id = 1001)
-> Hash (cost=6935.95..6935.95 rows=180386 width=16)
-> Seq Scan on tbl_comments c (cost=0.00..6935.95 rows=180386 width=16)
Filter: is_system