我已经使用serde来处理我的xml数据，并在其中为xml数据创建自定义inputformat和recordredaer。
下面是班级的签名-
serde类-

public class XMLSerde extends AbstractSerDe {

输入格式-

public class XMLInputFormat extends FileInputFormat<LongWritable, BookWritable> {

    @Override
    public RecordReader<LongWritable, BookWritable> createRecordReader(InputSplit arg0,
            TaskAttemptContext arg1) throws IOException, InterruptedException {
        // TODO Auto-generated method stub
        return new XMLRecordReader();
    }

录音阅读器-

public class XMLRecordReader extends RecordReader<LongWritable, BookWritable> {

bookwritable是我创建的自定义可写类。
现在，当我使用这个serde如下-

CREATE TABLE xml_items(Author STRING, Title STRING, ISBN STRING) ROW FORMAT SERDE 'com.xml.serde.XMLSerde' STORED AS INPUTFORMAT 'com.xml.serde.XMLInputFormat';

对此表运行select查询时出现以下错误。

FAILED: SemanticException 1:14 Input format must implement InputFormat. Error encountered near token 'books'

请建议。阿杰