QUERY PLAN
Finalize Aggregate (cost=10868.90..10868.91 rows=1 width=8)
-> Gather (cost=10868.79..10868.90 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=9868.79..9868.80 rows=1 width=8)
-> Nested Loop (cost=0.42..9868.28 rows=203 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3814.74 rows=1256 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 1001))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..4.82 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: (NOT is_system)