QUERY PLAN
Finalize Aggregate (cost=4463.19..4463.20 rows=1 width=8)
-> Gather (cost=4463.08..4463.19 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=3463.08..3463.09 rows=1 width=8)
-> Nested Loop (cost=0.42..3463.05 rows=11 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3344.93 rows=14 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 5064))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..8.44 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: is_system