private void updateColumnMaps(int columnIndex){
  deleteColumnIndexFromMaps(columnIndex);
  addColumnToColumnsMaps(columnIndex,columnMetaData.get(columnIndex));
}

private void updateColumnMaps ( int columnIndex ) { deleteColumnIndexFromMaps ( columnIndex ) ; addColumnToColumnsMaps ( columnIndex , columnMetaData . get ( columnIndex ) ) ; }
deletes the columnindex from the maps and adds it again .
