QUERY PLAN
Finalize Aggregate (cost=6739.45..6739.46 rows=1 width=8)
-> Gather (cost=6739.34..6739.45 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=5739.34..5739.35 rows=1 width=8)
-> Nested Loop (cost=0.42..5738.57 rows=306 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3248.68 rows=378 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1004))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..6.59 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: is_system