QUERY PLAN
Limit (cost=22169.95..22181.61 rows=100 width=158)
-> Gather Merge (cost=22169.95..26243.06 rows=34910 width=158)
Workers Planned: 2
-> Sort (cost=21169.92..21213.56 rows=17455 width=158)
Sort Key: (CASE WHEN ((c.created_by = 1001) OR uc.is_read) THEN true ELSE false END), c.created_at DESC
-> Merge Left Join (cost=8333.09..19940.10 rows=17455 width=158)
Merge Cond: (c.id = uc.comment_id)
Filter: ((uc.remind_user_id = 1001) OR (c.created_by = 1001))
-> Parallel Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..10962.03 rows=75177 width=153)
Filter: is_system
-> Sort (cost=8332.67..8433.69 rows=40406 width=9)
Sort Key: uc.comment_id
-> Seq Scan on tbl_unread_comments uc (cost=0.00..5241.15 rows=40406 width=9)
Filter: (remind_user_id = 1001)