/**
* 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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.udf.generic;
import java.lang.NullPointerException;
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.UDFArgumentTypeException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde.serdeConstants;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
/**
* GenericUDFEvaluateNPE
* This UDF is to throw an Null Pointer Exception
* It is used to test hive failure handling
*
*/
@Description(name = "evaluate_npe", value = "_FUNC_(string) - "
+ "Throws an NPE in the GenericUDF.evaluate() method. "
+ "Used for testing GenericUDF error handling.")
public class GenericUDFEvaluateNPE extends GenericUDF {
private ObjectInspector[] argumentOIs;
private final Text result= new Text();
@Override
public ObjectInspector initialize(ObjectInspector[] arguments)
throws UDFArgumentException {
if (arguments.length != 1) {
throw new UDFArgumentLengthException(
"The function evaluate_npe(string)"
+ "needs only one argument.");
}
if (!arguments[0].getTypeName().equals(serdeConstants.STRING_TYPE_NAME)) {
throw new UDFArgumentTypeException(0,
"Argument 1 of function evaluate_npe must be \""
+ serdeConstants.STRING_TYPE_NAME + "but \""
+ arguments[0].getTypeName() + "\" was found.");
}
argumentOIs = arguments;
return PrimitiveObjectInspectorFactory.writableStringObjectInspector;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
if (true) {
throw new NullPointerException("evaluate null pointer exception");
}
return result;
}
@Override
public String getDisplayString(String[] children) {
assert (children.length == 1);
return "evaluate_npe(" + children[0] + ")";
}
}