QUERY PLAN
Finalize Aggregate (cost=9346.58..9346.59 rows=1 width=8)
-> Gather (cost=9346.47..9346.58 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=8346.47..8346.48 rows=1 width=8)
-> Nested Loop (cost=0.42..8344.29 rows=869 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3231.58 rows=1062 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1001))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..4.81 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: is_system