| /* |
| * 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.druid.query.topn; |
| |
| import org.apache.druid.query.aggregation.BufferAggregator; |
| import org.apache.druid.segment.Cursor; |
| import org.apache.druid.segment.DimensionSelector; |
| |
| import java.nio.ByteBuffer; |
| |
| public interface Generic2AggPooledTopNScanner |
| { |
| /** |
| * @param aggregator1Size number of bytes required by aggregator1 for a single aggregation |
| * @param aggregator2Size number of bytes required by aggregator2 for a single aggregation |
| * @param positions a cache for positions in resultsBuffer, where specific (indexed) dimension values are aggregated |
| * @return number of scanned rows, i. e. number of steps made with the given cursor |
| */ |
| long scanAndAggregate( |
| DimensionSelector dimensionSelector, |
| BufferAggregator aggregator1, |
| int aggregator1Size, |
| BufferAggregator aggregator2, |
| int aggregator2Size, |
| Cursor cursor, |
| int[] positions, |
| ByteBuffer resultsBuffer |
| ); |
| } |