ElasticSearchResultSet.findColumn()无效

[Drafthj]

` ElasticSearchResultSet中

public int findColumn(String columnLabel) throws SQLException {
    return ((ResultSetMetaDataBase) metaData).findColumn(columnLabel);
}`

findColumn使用了父类ResultSetMetaDataBase中columns

`

public ResultSetMetaDataBase(){
}

private final List<ColumnMetaData> columns = new ArrayList<ColumnMetaData>();
public List<ColumnMetaData> getColumns() {
    return columns;
} 
public int findColumn(String columnName) throws SQLException {
    for (int i = 0; i < columns.size(); ++i) {
        ColumnMetaData column = columns.get(i);
        if (column.getColumnName().equals(columnName)) {
            return i + 1;
        }
    }
    throw new SQLException("column '" + columnName + "' not found.");
}`