QUERY PLAN
Group (cost=18082.05..18086.13 rows=448 width=18)
Group Key: c.object_type, sub.unreadcount
-> Sort (cost=18082.05..18083.41 rows=544 width=10)
Sort Key: c.object_type, sub.unreadcount
-> Hash Left Join (cost=12863.17..18057.33 rows=544 width=10)
Hash Cond: ((c.object_type)::text = (sub.object_type)::text)
-> Hash Right Join (cost=8485.57..13678.09 rows=544 width=2)
Hash Cond: (uc.comment_id = c.id)
Filter: ((uc.remind_user_id = 5250) OR (c.created_by = 5250))
-> Seq Scan on tbl_unread_comments uc (cost=0.00..4467.15 rows=523 width=8)
Filter: (remind_user_id = 5250)
-> Hash (cost=5930.98..5930.98 rows=146927 width=10)
-> Seq Scan on tbl_comments c (cost=0.00..5930.98 rows=146927 width=10)
Filter: is_system
-> Hash (cost=4377.40..4377.40 rows=16 width=10)
-> Subquery Scan on sub (cost=4375.46..4377.40 rows=16 width=10)
-> Finalize GroupAggregate (cost=4375.46..4377.24 rows=16 width=10)
Group Key: uc_1.object_type
-> Gather Merge (cost=4375.46..4377.02 rows=12 width=10)
Workers Planned: 1
-> Partial GroupAggregate (cost=3375.45..3375.66 rows=12 width=10)
Group Key: uc_1.object_type
-> Sort (cost=3375.45..3375.48 rows=12 width=2)
Sort Key: uc_1.object_type
-> Nested Loop (cost=0.42..3375.24 rows=12 width=2)
-> Parallel Seq Scan on tbl_unread_comments uc_1 (cost=0.00..3248.68 rows=15 width=6)
Filter: ((NOT is_read) AND (remind_user_id = 5250))
-> 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