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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.hadoop.hive.udf.example;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Converter;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.DoubleObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorConverter;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils;
public class GenericUDFExampleAdd extends GenericUDF {
Converter converter0;
Converter converter1;
DoubleWritable result = new DoubleWritable();
@Override
public ObjectInspector initialize(ObjectInspector[] arguments)
throws UDFArgumentException {
ObjectInspector doubleOI = PrimitiveObjectInspectorFactory
.getPrimitiveWritableObjectInspector(PrimitiveObjectInspector.PrimitiveCategory.DOUBLE);
converter0 = (Converter) ObjectInspectorConverters.getConverter(arguments[0], doubleOI);
converter1 = (Converter) ObjectInspectorConverters.getConverter(arguments[1], doubleOI);
return doubleOI;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
DoubleWritable dw0 = (DoubleWritable) converter0.convert(arguments[0].get());
DoubleWritable dw1 = (DoubleWritable) converter1.convert(arguments[0].get());
if (dw0 == null || dw1 == null) {
return null;
}
result.set(dw0.get() + dw1.get());
return result;
}
@Override
public String getDisplayString(String[] children) {
return "GenericUDFExampleAdd";
}
}