| /* |
| * 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.phoenix.iterate; |
| |
| import java.util.List; |
| |
| import org.apache.phoenix.compile.ExplainPlanAttributes |
| .ExplainPlanAttributesBuilder; |
| import org.apache.phoenix.schema.tuple.Tuple; |
| import org.apache.phoenix.util.TupleUtil; |
| |
| |
| /** |
| * |
| * ResultIterator that does a merge sort on the list of iterators provided, |
| * returning the rows in row key ascending order. The iterators provided |
| * must be in row key ascending order. |
| * |
| * |
| * @since 0.1 |
| */ |
| public class MergeSortRowKeyResultIterator extends MergeSortResultIterator { |
| private final int keyOffset; |
| private final int factor; |
| |
| public MergeSortRowKeyResultIterator(ResultIterators iterators) { |
| this(iterators, 0, false); |
| } |
| |
| public MergeSortRowKeyResultIterator(ResultIterators iterators, int keyOffset, boolean isReverse) { |
| super(iterators); |
| this.keyOffset = keyOffset; |
| this.factor = isReverse ? -1 : 1; |
| } |
| |
| @Override |
| protected int compare(Tuple t1, Tuple t2) { |
| return factor * TupleUtil.compare(t1, t2, tempPtr, keyOffset); |
| } |
| |
| @Override |
| public void explain(List<String> planSteps) { |
| resultIterators.explain(planSteps); |
| planSteps.add("CLIENT MERGE SORT"); |
| } |
| |
| @Override |
| public void explain(List<String> planSteps, |
| ExplainPlanAttributesBuilder explainPlanAttributesBuilder) { |
| resultIterators.explain(planSteps, explainPlanAttributesBuilder); |
| explainPlanAttributesBuilder.setClientSortAlgo("CLIENT MERGE SORT"); |
| planSteps.add("CLIENT MERGE SORT"); |
| } |
| |
| @Override |
| public String toString() { |
| return "MergeSortRowKeyResultIterator [keyOffset=" + keyOffset |
| + ", factor=" + factor + "]"; |
| } |
| } |