QUERY PLAN
Finalize Aggregate (cost=6519.24..6519.25 rows=1 width=8)
-> Gather (cost=6519.13..6519.24 rows=1 width=8)
Workers Planned: 1
-> Partial Aggregate (cost=5519.13..5519.14 rows=1 width=8)
-> Nested Loop (cost=0.42..5518.97 rows=64 width=0)
-> Parallel Seq Scan on tbl_unread_comments uc (cost=0.00..3246.52 rows=338 width=4)
Filter: ((NOT is_read) AND (remind_user_id = 5252))
-> Index Scan using tbl_comments_pkey on tbl_comments c (cost=0.42..6.72 rows=1 width=4)
Index Cond: (id = uc.comment_id)
Filter: (NOT is_system)