QUERY PLAN
Finalize Aggregate (cost=9247.89..9247.90 rows=1 width=8)
-> Gather (cost=9247.77..9247.88 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=8247.77..8247.78 rows=1 width=8)
-> Nested Loop (cost=0.42..8247.29 rows=194 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3246.52 rows=1023 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1001))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..4.89 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: (NOT is_system)