src/main/java/org/criteria4jpa/projection/ConstructorProjection.java
public String toGroupByString(Criteria criteria, CriteriaQueryBuilder queryBuilder) {
    return projectionList.toGroupByString(criteria, queryBuilder);
  }
public String toGroupByString(Criteria criteria, CriteriaQueryBuilder queryBuilder) {
    return projectionList.toGroupByString(criteria, queryBuilder);
  }
/*
@see org.criteria4jpa.projection.Projection#toGroupByString(org.criteria4jpa.Criteria, org.criteria4jpa.impl.CriteriaQueryBuilder)