/**
* 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 org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentLengthException;
import org.apache.hadoop.hive.ql.exec.description;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.io.BooleanWritable;
@description(
name = "isnotnull",
value = "_FUNC_ a - Returns true if a is not NULL and false otherwise"
)
public class GenericUDFOPNotNull extends GenericUDF {
BooleanWritable result = new BooleanWritable();
@Override
public ObjectInspector initialize(ObjectInspector[] arguments)
throws UDFArgumentException {
if (arguments.length != 1) {
throw new UDFArgumentLengthException(
"The operator 'IS NOT NULL' only accepts 1 argument.");
}
return PrimitiveObjectInspectorFactory.writableBooleanObjectInspector;
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
result.set(arguments[0].get() != null);
return result;
}
@Override
public String getDisplayString(String[] children) {
assert (children.length == 1);
return children[0] + " is not null";
}
}