QUERY PLAN
Limit (cost=14786.78..14786.83 rows=20 width=157)
-> Sort (cost=14786.78..14806.76 rows=7994 width=157)
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=8111.11..14574.06 rows=7994 width=157)
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..5205.35 rows=39853 width=9)
Filter: (remind_user_id = 1001)
-> Hash (cost=6936.06..6936.06 rows=34564 width=152)
-> Seq Scan on tbl_comments c (cost=0.00..6936.06 rows=34564 width=152)
Filter: (NOT is_system)