@Override
    public int hashCode() {
        return super.hashCode() + (int)maxGroups + (int)precision + collect.hashCode() + Objects.hashCode(filter);
    }
<p>Tell if ordering will need results collected in children.</p>

@return If deeper resultcollection is needed.
searchlib/src/main/java/com/yahoo/searchlib/aggregation/GroupingLevel.java