docs: def getColumnByColumnAlias(self, name):
          """Returns a column from its name.
          Input
          -----
          name : columnAlias of the column to retrieve
          
          Return
          ------
          A Column object or None when the name cannot be found.        
          """
          result = None
          for column in self.__columns:
              columnAlias = column.getColumnAlias()
              if columnAlias == name:
                  result = column
                  break
          return result