@SuppressWarnings("unchecked")
    protected RES transform(Map<K, Group> groups) {
        return (RES) groups;
    }
Provides aggregated results as a map

@param <K> Map key type
@param <V> Map value type
@param <RES> Resulting map type
@author Jan-Willem Gmelig Meyling
querydsl-core/src/main/java/com/querydsl/core/group/GroupByGenericMap.java