/// <summary>
/// Adds the values of the fact fields in the two rows specified
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public virtual object[] MergeFacts(object[] x, object[] y)
{
foreach (var f in Schema.Facts)
{
if (!Adders.ContainsKey(f.Value.ValueType))
{
throw new InvalidOperationException(string.Format("Facts of type {0} are not supported", f.Value.ValueType));
}
var ix = f.Index;
x[ix] = Adders[f.Value.ValueType](x[ix], y[ix]);
}
return(x);
}
