生成udtf java代码

好的，以下是一个简单的UDTF Java代码示例，用于将输入的字符串拆分为单词并输出每个单词和它的长度。

import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentLengthException;
import org.apache.hadoop.hive.ql.exec.UDTF;
import org.apache.hadoop.hive.ql.udf.UDFType;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.StringObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector;
import org.apache.hadoop.io.Text;

import java.util.ArrayList;

@Description(name = "split_words", value = "Splits a string into words and outputs each word and its length as a separate row")
@UDFType(deterministic = false, stateful = false)
public class SplitWordsUDTF extends UDTF {

    private final Text outputText = new Text();

    private StringObjectInspector inputOI;

    @Override
    public StructObjectInspector initialize(ObjectInspector[] argOIs) throws UDFArgumentException {
        if (argOIs.length != 1) {
            throw new UDFArgumentLengthException("split_words() takes exactly one argument");
        }

        if (argOIs[0].getCategory() != ObjectInspector.Category.PRIMITIVE
                || !((PrimitiveObjectInspector) argOIs[0]).getPrimitiveCategory().equals(PrimitiveObjectInspector.PrimitiveCategory.STRING)) {
            throw new UDFArgumentException("split_words() takes a string as argument");
        }

        inputOI = (StringObjectInspector) argOIs[0];

        ArrayList<String> fieldNames = new ArrayList<>();
        ArrayList<ObjectInspector> fieldOIs = new ArrayList<>();

        fieldNames.add("word");
        fieldOIs.add(PrimitiveObjectInspectorFactory.writableStringObjectInspector);

        fieldNames.add("length");
        fieldOIs.add(PrimitiveObjectInspectorFactory.writableIntObjectInspector);

        return ObjectInspectorFactory.getStandardStructObjectInspector(fieldNames, fieldOIs);
    }

    @Override
    public void process(Object[] args) throws UDFArgumentException {
        String input = inputOI.getPrimitiveJavaObject(args[0]).toString();
        String[] words = input.split("\\s+");

        for (String word : words) {
            outputText.set(word);
            forward(outputText, new IntWritable(word.length()));
        }
    }

    @Override
    public void close() throws UDFArgumentException {
        // Nothing to do
    }
}

您可以将此代码复制到您的Java IDE（如Eclipse或IntelliJ IDEA）中，并进行必要的修改，以符合您的UDTF需求。