/**
* 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.Description;
import org.apache.hadoop.hive.ql.metadata.HiveException;
@Description(name = "<=>", value = "a _FUNC_ b - Returns same result with EQUAL(=) operator " +
"for non-null operands, but returns TRUE if both are NULL, FALSE if one of the them is NULL")
@NDV(maxNdv = 2)
public class GenericUDFOPEqualNS extends GenericUDFOPEqual {
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
Object o0 = arguments[0].get();
Object o1 = arguments[1].get();
if (o0 == null && o1 == null) {
result.set(true);
return result;
}
if (o0 == null || o1 == null) {
result.set(false);
return result;
}
return super.evaluate(arguments);
}
@Override
public GenericUDF negative() {
return new GenericUDFOPNotEqualNS();
}
}