Add comments about removing subqueries

ros/api/v1/hosts.py

@@ -129,6 +129,8 @@ def get(self):
         system_query = system_ids_by_org_id(org_id).filter(*self.build_system_filters())
         sort_expression = self.build_sort_expression(order_how, order_by)
 
+        # we don't need to convert query in subquery now, using it also raises warning,
+        # Coercing Subquery object into a select() for use in IN(); please pass a select() construct explicitly
         query = (
             db.session.query(PerformanceProfile, System, RhAccount)
             .join(System, System.id == PerformanceProfile.system_id)
@@ -283,6 +285,8 @@ def get(self, host_id):
         username = user['username'] if 'username' in user else None
         org_id = org_id_from_identity_header(request)
 
+        # we don't need to convert query in subquery now, using it also raises warning,
+        # Coercing Subquery object into a select() for use in IN(); please pass a select() construct explicitly
         system_query = system_ids_by_org_id(org_id).filter(System.inventory_id == host_id)
 
         profile = PerformanceProfile.query.filter(
@@ -347,6 +351,8 @@ def get(self, host_id):
 
         org_id = org_id_from_identity_header(request)
 
+        # we don't need to convert query in subquery now, using it also raises warning,
+        # Coercing Subquery object into a select() for use in IN(); please pass a select() construct explicitly
         system_query = system_ids_by_org_id(org_id).filter(System.inventory_id == host_id)
 
         query = PerformanceProfileHistory.query.filter(