QUERY PLAN
Finalize Aggregate (cost=7474.94..7474.95 rows=1 width=8)
-> Gather (cost=7474.83..7474.94 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=6474.83..6474.84 rows=1 width=8)
-> Nested Loop (cost=0.42..6473.99 rows=333 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3801.85 rows=397 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1011))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..6.73 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: is_system