Bug with "Group By" in Reports module 7.6.4 ( Screens Attached )

in 7.6.4 irrespective of whether group is selected for the filed or not , reports module is adding adding group by on all the fields.

Query Log

SELECT opportunities.assigned_user_id AS ‘Assigned_to0’, COUNT(opportunities.id) AS ‘ID1’ FROM opportunities WHERE opportunities.deleted = 0 GROUP BY opportunities.assigned_user_id, opportunities.id LIMIT 0,20