QUERY PLAN
Finalize Aggregate (cost=8207.51..8207.52 rows=1 width=8)
-> Gather (cost=8207.39..8207.50 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=7207.39..7207.40 rows=1 width=8)
-> Nested Loop (cost=0.42..7207.18 rows=86 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3784.44 rows=539 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 5252))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..6.35 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: (NOT is_system)