#1737 - PersistenceException while using aggregate query on related entity

This part includes support for joins off an aggregation formula
on a ManyToOne.

e.g. We use min(customer) ... to 'query join' to customer
in the query below.

    List<Contact> contacts = Ebean.find(Contact.class)
      .select("lastName, min(customer)")
      .fetchQuery("customer", "name, status")
      .findList();

src/main/java/io/ebeaninternal/server/deploy/DynamicPropertyAggregationFormulaMTO.java

@@ -11,6 +11,11 @@ public class DynamicPropertyAggregationFormulaMTO extends DynamicPropertyAggrega
     this.prop = prop;
   }
 
+  @Override
+  public boolean isAggregationManyToOne() {
+    return true;
+  }
+
   @Override
   public void load(SqlBeanLoad sqlBeanLoad) {
     Object value;