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* Licensed to the Apache Software Foundation (ASF) under one
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* 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.
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package org.apache.hadoop.hive.ql.udf.generic;
import junit.framework.TestCase;
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.ql.udf.generic.GenericUDF.DeferredJavaObject;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
public class TestGenericUDFLevenshtein extends TestCase {
public void testLevenshtein() throws HiveException {
GenericUDFLevenshtein udf = new GenericUDFLevenshtein();
ObjectInspector valueOI0 = PrimitiveObjectInspectorFactory.writableStringObjectInspector;
ObjectInspector valueOI1 = PrimitiveObjectInspectorFactory.writableStringObjectInspector;
ObjectInspector[] arguments = { valueOI0, valueOI1 };
udf.initialize(arguments);
runAndVerify("kitten", "sitting", 3, udf);
runAndVerify("Test String1", "Test String2", 1, udf);
runAndVerify("Test String1", "test String2", 2, udf);
runAndVerify("Test String1", "", 12, udf);
runAndVerify("", "Test String2", 12, udf);
runAndVerify(null, "sitting", null, udf);
runAndVerify("kitten", null, null, udf);
runAndVerify(null, null, null, udf);
}
public void testLevenshteinWrongType0() throws HiveException {
@SuppressWarnings("resource")
GenericUDFLevenshtein udf = new GenericUDFLevenshtein();
ObjectInspector valueOI0 = PrimitiveObjectInspectorFactory.writableIntObjectInspector;
ObjectInspector valueOI1 = PrimitiveObjectInspectorFactory.writableStringObjectInspector;
ObjectInspector[] arguments = { valueOI0, valueOI1 };
try {
udf.initialize(arguments);
assertTrue("levenshtein test. UDFArgumentTypeException is expected", false);
} catch (UDFArgumentTypeException e) {
assertEquals("levenshtein test",
"levenshtein only takes STRING_GROUP, VOID_GROUP types as 1st argument, got INT", e.getMessage());
}
}
public void testLevenshteinWrongType1() throws HiveException {
@SuppressWarnings("resource")
GenericUDFLevenshtein udf = new GenericUDFLevenshtein();
ObjectInspector valueOI0 = PrimitiveObjectInspectorFactory.writableHiveVarcharObjectInspector;
ObjectInspector valueOI1 = PrimitiveObjectInspectorFactory.writableFloatObjectInspector;
ObjectInspector[] arguments = { valueOI0, valueOI1 };
try {
udf.initialize(arguments);
assertTrue("levenshtein test. UDFArgumentTypeException is expected", false);
} catch (UDFArgumentTypeException e) {
assertEquals("levenshtein test",
"levenshtein only takes STRING_GROUP, VOID_GROUP types as 2nd argument, got FLOAT", e.getMessage());
}
}
public void testLevenshteinWrongLength() throws HiveException {
@SuppressWarnings("resource")
GenericUDFLevenshtein udf = new GenericUDFLevenshtein();
ObjectInspector valueOI0 = PrimitiveObjectInspectorFactory.writableHiveVarcharObjectInspector;
ObjectInspector[] arguments = { valueOI0 };
try {
udf.initialize(arguments);
assertTrue("levenshtein test. UDFArgumentLengthException is expected", false);
} catch (UDFArgumentLengthException e) {
assertEquals("levenshtein test", "levenshtein requires 2 argument(s), got 1", e.getMessage());
}
}
private void runAndVerify(String str0, String str1, Integer expResult, GenericUDF udf)
throws HiveException {
DeferredObject valueObj0 = new DeferredJavaObject(str0 != null ? new Text(str0) : null);
DeferredObject valueObj1 = new DeferredJavaObject(str1 != null ? new Text(str1) : null);
DeferredObject[] args = { valueObj0, valueObj1 };
IntWritable output = (IntWritable) udf.evaluate(args);
if (expResult == null) {
assertNull("levenshtein test ", output);
} else {
assertNotNull("levenshtein test", output);
assertEquals("levenshtein test", expResult.intValue(), output.get());
}
}
}