QUERY PLAN
Aggregate (cost=9982.69..9982.70 rows=1 width=8)
-> Sort (cost=9981.01..9981.29 rows=112 width=248)
Sort Key: (CASE WHEN ((c.created_by = 1000) OR uc.is_read) THEN true ELSE false END), c.created_at DESC
-> Hash Right Join (cost=5810.51..9977.20 rows=112 width=248)
Hash Cond: (uc.comment_id = c.id)
Filter: ((uc.remind_user_id = 1000) OR (c.created_by = 1000))
-> Seq Scan on tbl_unread_comments uc (cost=0.00..4165.14 rows=484 width=9)
Filter: (remind_user_id = 1000)
-> Hash (cost=5411.97..5411.97 rows=31883 width=16)
-> Seq Scan on tbl_comments c (cost=0.00..5411.97 rows=31883 width=16)
Filter: (NOT is_system)