QUERY PLAN
Finalize Aggregate (cost=10862.16..10862.17 rows=1 width=8)
-> Gather (cost=10862.04..10862.15 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=9862.04..9862.05 rows=1 width=8)
-> Nested Loop (cost=0.42..9861.54 rows=202 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3812.59 rows=1255 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)