QUERY PLAN
GroupAggregate (cost=4450.27..4454.20 rows=1 width=12)
Group Key: uc.object_id
-> Nested Loop (cost=4450.27..4454.18 rows=1 width=4)
-> Gather Merge (cost=4450.00..4450.21 rows=1 width=8)
Workers Planned: 1
-> Merge Join (cost=3449.99..3450.09 rows=1 width=8)
Merge Cond: (uc.object_id = rccr.approve_id)
-> Sort (cost=3359.07..3359.14 rows=28 width=4)
Sort Key: uc.object_id
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3358.40 rows=28 width=4)
Filter: ((NOT is_read) AND ((object_type)::text = '37'::text) AND (remind_user_id = 1004))
-> Sort (cost=90.92..90.94 rows=11 width=4)
Sort Key: rccr.approve_id
-> Seq Scan on tbl_approve_carbon_copy_rels rccr (cost=0.00..90.72 rows=11 width=4)
Filter: (user_id = 1004)
-> Index Scan using tbl_approves_pkey on tbl_approves r (cost=0.28..3.96 rows=1 width=4)
Index Cond: (id = uc.object_id)
Filter: (status <> '0'::smallint)