QUERY PLAN
Sort (cost=22103.74..22105.49 rows=700 width=18)
Sort Key: c.object_type
-> HashAggregate (cost=22063.66..22070.66 rows=700 width=18)
Group Key: c.object_type, sub.unreadcount
-> Hash Left Join (cost=16658.66..21909.52 rows=30829 width=10)
Hash Cond: ((c.object_type)::text = (sub.object_type)::text)
-> Hash Right Join (cost=7729.40..12887.07 rows=30829 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..4165.14 rows=32587 width=8)
Filter: (remind_user_id = 1001)
-> Hash (cost=5411.97..5411.97 rows=133314 width=10)
-> Seq Scan on tbl_comments c (cost=0.00..5411.97 rows=133314 width=10)
Filter: is_system
-> Hash (cost=8928.96..8928.96 rows=25 width=10)
-> Subquery Scan on sub (cost=8919.07..8928.96 rows=25 width=10)
-> Finalize GroupAggregate (cost=8919.07..8928.71 rows=25 width=10)
Group Key: uc_1.object_type
-> Gather Merge (cost=8919.07..8928.33 rows=25 width=10)
Workers Planned: 1
-> Partial GroupAggregate (cost=7919.06..7925.51 rows=25 width=10)
Group Key: uc_1.object_type
-> Sort (cost=7919.06..7921.13 rows=826 width=2)
Sort Key: uc_1.object_type
-> Nested Loop (cost=0.42..7879.05 rows=826 width=2)
-> Parallel Seq Scan on tbl_unread_comments uc_1 (cost=0.00..3029.02 rows=1024 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..4.74 rows=1 width=4)
Index Cond: (id = uc_1.comment_id)
Filter: is_system