QUERY PLAN
Finalize Aggregate (cost=7657.88..7657.89 rows=1 width=8)
-> Gather (cost=7657.77..7657.88 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=6657.77..6657.78 rows=1 width=8)
-> Nested Loop (cost=0.42..6656.46 rows=525 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3029.02 rows=651 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1005))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..5.57 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: is_system