public Text getGroupingText(String label) {
        HadoopObject o = getHadoopObject(KEY, label, ObjectUtil.STRING, "String");
        if (o == null) {
            return null;
        }
        return (Text) o.getObject();
    }
public Text getGroupingText ( String label ) { HadoopObject o = getHadoopObject ( KEY , label , ObjectUtil . STRING , "String" ) ; if ( o == null ) { return null ; } return ( Text ) o . getObject ( ) ; }
Get grouping {@link Text} value
@param label target label
@return {@link Text} value of the label. If it is not null.