QUERY PLAN
Finalize Aggregate (cost=9519.73..9519.74 rows=1 width=8)
-> Gather (cost=9519.62..9519.73 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=8519.62..8519.63 rows=1 width=8)
-> Nested Loop (cost=0.42..8517.41 rows=884 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3320.21 rows=1071 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1001))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..4.85 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: is_system