QUERY PLAN
Group (cost=20318.11..20341.49 rows=2444 width=18)
Group Key: c.object_type, sub.unreadcount
-> Sort (cost=20318.11..20325.90 rows=3117 width=10)
Sort Key: c.object_type, sub.unreadcount
-> Hash Left Join (cost=14862.48..20137.23 rows=3117 width=10)
Hash Cond: ((c.object_type)::text = (sub.object_type)::text)
-> Hash Right Join (cost=7366.74..12632.64 rows=3117 width=2)
Hash Cond: (uc.comment_id = c.id)
Filter: ((uc.remind_user_id = 1011) OR (c.created_by = 1011))
-> Seq Scan on tbl_unread_comments uc (cost=0.00..5232.30 rows=12800 width=8)
Filter: (remind_user_id = 1011)
-> Hash (cost=6933.05..6933.05 rows=34695 width=10)
-> Seq Scan on tbl_comments c (cost=0.00..6933.05 rows=34695 width=10)
Filter: (NOT is_system)
-> Hash (cost=7495.16..7495.16 rows=47 width=11)
-> Subquery Scan on sub (cost=7487.75..7495.16 rows=47 width=11)
-> Finalize GroupAggregate (cost=7487.75..7494.69 rows=47 width=11)
Group Key: uc_1.object_type
-> Gather Merge (cost=7487.75..7493.98 rows=47 width=11)
Workers Planned: 1
-> Partial GroupAggregate (cost=6487.74..6488.69 rows=47 width=11)
Group Key: uc_1.object_type
-> Sort (cost=6487.74..6487.90 rows=64 width=3)
Sort Key: uc_1.object_type
-> Nested Loop (cost=0.42..6485.82 rows=64 width=3)
-> Parallel Seq Scan on tbl_unread_comments uc_1 (cost=0.00..3808.29 rows=398 width=7)
Filter: ((NOT is_read) AND (remind_user_id = 1011))
-> Index Scan using tbl_comments_pkey on tbl_comments c_1 (cost=0.42..6.73 rows=1 width=4)
Index Cond: (id = uc_1.comment_id)
Filter: (NOT is_system)