QUERY PLAN
Sort (cost=23680.63..23682.44 rows=725 width=18)
Sort Key: c.object_type
-> HashAggregate (cost=23638.93..23646.18 rows=725 width=18)
Group Key: c.object_type, sub.unreadcount
-> Hash Left Join (cost=17847.60..23472.13 rows=33360 width=10)
Hash Cond: ((c.object_type)::text = (sub.object_type)::text)
-> Hash Right Join (cost=8450.36..13974.53 rows=33360 width=2)
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..4443.69 rows=34469 width=8)
Filter: (remind_user_id = 1001)
-> Hash (cost=5888.77..5888.77 rows=147327 width=10)
-> Seq Scan on tbl_comments c (cost=0.00..5888.77 rows=147327 width=10)
Filter: is_system
-> Hash (cost=9396.93..9396.93 rows=25 width=10)
-> Subquery Scan on sub (cost=9386.73..9396.93 rows=25 width=10)
-> Finalize GroupAggregate (cost=9386.73..9396.68 rows=25 width=10)
Group Key: uc_1.object_type
-> Gather Merge (cost=9386.73..9396.31 rows=25 width=10)
Workers Planned: 1
-> Partial GroupAggregate (cost=8386.72..8393.48 rows=25 width=10)
Group Key: uc_1.object_type
-> Sort (cost=8386.72..8388.89 rows=869 width=2)
Sort Key: uc_1.object_type
-> Nested Loop (cost=0.42..8344.29 rows=869 width=2)
-> Parallel Seq Scan on tbl_unread_comments uc_1 (cost=0.00..3231.58 rows=1062 width=6)
Filter: ((NOT is_read) AND (remind_user_id = 1001))
-> Index Scan using tbl_comments_pkey on tbl_comments c_1 (cost=0.42..4.81 rows=1 width=4)
Index Cond: (id = uc_1.comment_id)
Filter: is_system