QUERY PLAN
Finalize Aggregate (cost=7369.88..7369.89 rows=1 width=8)
-> Gather (cost=7369.77..7369.88 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=6369.77..6369.78 rows=1 width=8)
-> Nested Loop (cost=0.42..6368.98 rows=316 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3816.88 rows=376 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1013))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..6.79 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: is_system