| /* |
| * 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.pig.data; |
| |
| import org.apache.hadoop.conf.Configurable; |
| import org.apache.hadoop.io.RawComparator; |
| |
| import org.apache.pig.classification.InterfaceAudience; |
| import org.apache.pig.classification.InterfaceStability; |
| |
| /** |
| * This interface is intended to compare Tuples. The semantics of Tuple comparison must take into account null values in |
| * different ways. According to SQL semantics nulls are not equal. But for other Pig/Latin statements nulls must be |
| * grouped together. This interface allows to check if there are null fields in the tuples compared using this |
| * comparator. This method is meaningful only when the tuples are determined to be equal by the |
| * {@link #compare(byte[],int,int,byte[],int,int)} method. |
| * |
| */ |
| @InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| @SuppressWarnings("rawtypes") |
| public interface TupleRawComparator extends RawComparator, Configurable { |
| /** |
| * Checks if one of the compared tuples had a null field. This method is meaningful only when |
| * {@link #compare(byte[],int,int,byte[],int,int)} has returned a zero value (i.e. tuples are determined to be |
| * equal). |
| * |
| * @return true if one of the compared tuples had a null field, false otherwise. |
| */ |
| public boolean hasComparedTupleNull(); |
| } |