QUERY PLAN
Sort (cost=23827.29..23833.40 rows=2444 width=18)
Sort Key: c.object_type
-> HashAggregate (cost=23665.32..23689.76 rows=2444 width=18)
Group Key: c.object_type, sub.unreadcount
-> Hash Left Join (cost=18254.93..23625.02 rows=8059 width=10)
Hash Cond: ((c.object_type)::text = (sub.object_type)::text)
-> Hash Right Join (cost=7369.81..12717.03 rows=8059 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..5241.15 rows=40406 width=8)
Filter: (remind_user_id = 1001)
-> Hash (cost=6935.95..6935.95 rows=34709 width=10)
-> Seq Scan on tbl_comments c (cost=0.00..6935.95 rows=34709 width=10)
Filter: (NOT is_system)
-> Hash (cost=10884.53..10884.53 rows=47 width=11)
-> Subquery Scan on sub (cost=10876.07..10884.53 rows=47 width=11)
-> Finalize GroupAggregate (cost=10876.07..10884.06 rows=47 width=11)
Group Key: uc_1.object_type
-> Gather Merge (cost=10876.07..10883.35 rows=47 width=11)
Workers Planned: 1
-> Partial GroupAggregate (cost=9876.06..9878.05 rows=47 width=11)
Group Key: uc_1.object_type
-> Sort (cost=9876.06..9876.57 rows=203 width=3)
Sort Key: uc_1.object_type
-> Nested Loop (cost=0.42..9868.28 rows=203 width=3)
-> Parallel Seq Scan on tbl_unread_comments uc_1 (cost=0.00..3814.74 rows=1256 width=7)
Filter: ((NOT is_read) AND (remind_user_id = 1001))
-> Index Scan using tbl_comments_pkey on tbl_comments c_1 (cost=0.42..4.82 rows=1 width=4)
Index Cond: (id = uc_1.comment_id)
Filter: (NOT is_system)