| /* |
| * 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.sql.SQLException; |
| |
| import org.apache.hadoop.hbase.KeyValue; |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.phoenix.expression.aggregator.Aggregators; |
| import org.apache.phoenix.schema.tuple.SingleKeyValueTuple; |
| import org.apache.phoenix.schema.tuple.Tuple; |
| |
| |
| |
| /** |
| * |
| * Result scanner that aggregates the row count value for rows with duplicate keys. |
| * The rows from the backing result iterator must be in key sorted order. For example, |
| * given the following input: |
| * a 1 |
| * a 2 |
| * b 1 |
| * b 3 |
| * c 1 |
| * the following will be output: |
| * a 3 |
| * b 4 |
| * c 1 |
| * |
| * |
| * @since 0.1 |
| */ |
| public class GroupedAggregatingResultIterator extends BaseGroupedAggregatingResultIterator { |
| |
| public GroupedAggregatingResultIterator(PeekingResultIterator resultIterator, Aggregators aggregators) { |
| super(resultIterator, aggregators); |
| } |
| |
| @Override |
| protected ImmutableBytesWritable getGroupingKey(Tuple tuple, ImmutableBytesWritable ptr) throws SQLException { |
| tuple.getKey(ptr); |
| return ptr; |
| } |
| |
| @Override |
| protected Tuple wrapKeyValueAsResult(KeyValue keyValue) throws SQLException { |
| return new SingleKeyValueTuple(keyValue); |
| } |
| |
| @Override |
| public String toString() { |
| return "GroupedAggregatingResultIterator [resultIterator=" |
| + resultIterator + ", aggregators=" + aggregators + "]"; |
| } |
| } |