QUERY PLAN
Group (cost=17229.81..17230.73 rows=122 width=18)
Group Key: c.object_type, sub.unreadcount
-> Sort (cost=17229.81..17230.12 rows=122 width=10)
Sort Key: c.object_type, sub.unreadcount
-> Hash Left Join (cost=13346.98..17225.59 rows=122 width=10)
Hash Cond: ((c.object_type)::text = (sub.object_type)::text)
-> Hash Right Join (cost=8371.35..12249.61 rows=122 width=2)
Hash Cond: (uc.comment_id = c.id)
Filter: ((uc.remind_user_id = 1000) OR (c.created_by = 1000))
-> Gather (cost=1000.00..4876.64 rows=619 width=8)
Workers Planned: 1
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3814.74 rows=364 width=8)
Filter: (remind_user_id = 1000)
-> Hash (cost=6937.40..6937.40 rows=34716 width=10)
-> Seq Scan on tbl_comments c (cost=0.00..6937.40 rows=34716 width=10)
Filter: (NOT is_system)
-> Hash (cost=4975.57..4975.57 rows=5 width=11)
-> Subquery Scan on sub (cost=4975.45..4975.57 rows=5 width=11)
-> Finalize GroupAggregate (cost=4975.45..4975.52 rows=5 width=11)
Group Key: uc_1.object_type
-> Sort (cost=4975.45..4975.46 rows=3 width=11)
Sort Key: uc_1.object_type
-> Gather (cost=4975.07..4975.42 rows=3 width=11)
Workers Planned: 1
-> Partial GroupAggregate (cost=3975.07..3975.12 rows=3 width=11)
Group Key: uc_1.object_type
-> Sort (cost=3975.07..3975.08 rows=3 width=3)
Sort Key: uc_1.object_type
-> Nested Loop (cost=0.42..3975.05 rows=3 width=3)
-> Parallel Seq Scan on tbl_unread_comments uc_1 (cost=0.00..3814.74 rows=19 width=7)
Filter: ((NOT is_read) AND (remind_user_id = 1000))
-> 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: (NOT is_system)