if grouping is performed on the same attribute as the aggregate function is applied, don't add this item to the mapping structure
if grouping is performed on the same attribute as the
aggregate function is applied, don't add this item to
the mapping structure

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb