code: public static function setVariantSupport($strTableName, $blnVariantSupport)
      {
          if ($blnVariantSupport) {
              if (self::getDB()->tableExists($strTableName, null, true)
                  && (!self::getDB()->fieldExists('varbase', $strTableName, true))
              ) {
                  self::createColumn($strTableName, 'varbase', 'char(1) NOT NULL default \'\'', true);
                  self::createColumn($strTableName, 'vargroup', 'int(11) NOT NULL default 0', true);
  
                  // If there is pre-existing data in the table, we need to provide a separate 'vargroup' value to all of
                  // them, we can do this safely by setting all vargroups to the id of the base item.
                  self::getDB()->execute(sprintf('UPDATE %s SET vargroup=id, varbase=1', $strTableName));
              }
          } else {
              if (self::getDB()->tableExists($strTableName, null, true)
                  && self::getDB()->fieldExists('varbase', $strTableName, true)
              ) {
                  self::dropColumn($strTableName, 'varbase', true);
                  self::dropColumn($strTableName, 'vargroup', true);
              }
          }
      }
docs: Enables or disables Variant support on a certain MetaModel table.
  
  @param string $strTableName      The table name of the MetaModel.
  
  @param bool   $blnVariantSupport Flag if the support shall be turned on or off.
  
  @return void