QUERY PLAN
Group (cost=20815.04..20819.81 rows=636 width=18)
Group Key: c.object_type, sub.unreadcount
-> Sort (cost=20815.04..20816.63 rows=636 width=10)
Sort Key: c.object_type, sub.unreadcount
-> Hash Left Join (cost=16031.45..20785.42 rows=636 width=10)
Hash Cond: ((c.object_type)::text = (sub.object_type)::text)
-> Hash Right Join (cost=11066.01..15818.19 rows=636 width=2)
Hash Cond: (uc.comment_id = c.id)
Filter: ((uc.remind_user_id = 5064) OR (c.created_by = 5064))
-> Gather (cost=1000.00..4863.55 rows=617 width=8)
Workers Planned: 1
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3801.85 rows=363 width=8)
Filter: (remind_user_id = 5064)
-> Hash (cost=6931.60..6931.60 rows=180273 width=10)
-> Seq Scan on tbl_comments c (cost=0.00..6931.60 rows=180273 width=10)
Filter: is_system
-> Hash (cost=4965.14..4965.14 rows=24 width=11)
-> Subquery Scan on sub (cost=4962.50..4965.14 rows=24 width=11)
-> Finalize GroupAggregate (cost=4962.50..4964.90 rows=24 width=11)
Group Key: uc_1.object_type
-> Gather Merge (cost=4962.50..4964.58 rows=16 width=11)
Workers Planned: 1
-> Partial GroupAggregate (cost=3962.49..3962.77 rows=16 width=11)
Group Key: uc_1.object_type
-> Sort (cost=3962.49..3962.53 rows=16 width=3)
Sort Key: uc_1.object_type
-> Nested Loop (cost=0.42..3962.17 rows=16 width=3)
-> Parallel Seq Scan on tbl_unread_comments uc_1 (cost=0.00..3801.85 rows=19 width=7)
Filter: ((NOT is_read) AND (remind_user_id = 5064))
-> Index Scan using tbl_comments_pkey on tbl_comments c_1 (cost=0.42..8.44 rows=1 width=4)
Index Cond: (id = uc_1.comment_id)
Filter: is_system