@Override
            protected Map<K, V> transform(Map<K, Group> groups) {
                Map<K, V> results = new LinkedHashMap<K, V>((int) Math.ceil(groups.size() / 0.75), 0.75f);
                for (Map.Entry<K, Group> entry : groups.entrySet()) {
                    results.put(entry.getKey(), entry.getValue().getOne(lookup));
                }
                return results;
            }
Get the results as a map

@param expression projection
@return new result transformer
querydsl-core/src/main/java/com/querydsl/core/group/GroupByBuilder.java