QUERY PLAN
HashAggregate (cost=6.64..7.30 rows=66 width=4)
Group Key: user_id
-> Seq Scan on tbl_user_role_change_logs (cost=0.00..6.45 rows=76 width=4)
Filter: ((user_id IS NOT NULL) AND ((role_name)::text = 'AccountManager'::text))