code: protected Column getColumn(String name) {
  		for (Column column : getColumns()) {
  			if (column.getColumnName().equals(name)) {
  				return column;
  			}
  		}
  		return null;
  	}
docs: Find for the column associated with the given name.
  
  @param name column name.
  @return return the column if exits, otherwise returns null.