@Override
    public void visitMembers(ObjectVisitor visitor) {
        super.visitMembers(visitor);
        visitor.visit("sum", sum);
        visitor.visit("count", count);
    }
Returns the average value of the results. Because the result can be any numeric type, this method returns a
{@link NumericResultNode} object.

@return The average result value.
searchlib/src/main/java/com/yahoo/searchlib/aggregation/AverageAggregationResult.java