QUERY PLAN
Limit (cost=22162.68..22174.35 rows=100 width=158)
-> Gather Merge (cost=22162.68..26234.86 rows=34902 width=158)
Workers Planned: 2
-> Sort (cost=21162.66..21206.28 rows=17451 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=8328.21..19933.14 rows=17451 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..10960.24 rows=75161 width=153)
Filter: is_system
-> Sort (cost=8327.79..8428.75 rows=40383 width=9)
Sort Key: uc.comment_id
-> Seq Scan on tbl_unread_comments uc (cost=0.00..5238.20 rows=40383 width=9)
Filter: (remind_user_id = 1001)