protected static function unregisterFactMeasure(CubeMetaData $cube, $columnName, $functionName)
 {
     $measureName = StarSchemaNamingConvention::getFactRelatedMeasureName($columnName, $functionName);
     $measure = $cube->findMeasure($measureName);
     if (isset($measure)) {
         $cube->unregisterMeasure($measureName);
     }
 }