public IEnumerable <IEnumerable <IEnumerable <KeyValuePair <string, object> > > > ExecuteFunction(string functionName, IDictionary <string, object> parameters)
{
var function = _schema.FindFunction(functionName);
var formattedParameters = new ValueFormatter().Format(parameters, "&");
var commandText = function.ActualName + "?" + formattedParameters;
var command = new HttpCommand(function.HttpMethod.ToUpper(), commandText.ToString());
_requestBuilder.AddCommandToRequest(command);
return(_requestRunner.ExecuteFunction(command));
}