| /* |
| * 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.iotdb.db.queryengine.execution.operator.process.join.merge; |
| |
| import org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| import org.apache.iotdb.tsfile.read.common.block.column.ColumnBuilder; |
| import org.apache.iotdb.tsfile.read.common.block.column.TimeColumnBuilder; |
| |
| /** used to merge columns belonging to same series into one column. */ |
| public interface ColumnMerger { |
| |
| /** |
| * judge whether TsBlock at tsBlockIndex is empty. |
| * |
| * @param tsBlockIndex index |
| * @param inputTsBlocks input TsBlock array |
| * @param inputIndex current index for each input TsBlock and size of it is equal to inputTsBlocks |
| * @return true if TsBlock at tsBlockIndex is null or its current read index is larger than its |
| * size |
| */ |
| static boolean empty(int tsBlockIndex, TsBlock[] inputTsBlocks, int[] inputIndex) { |
| return inputTsBlocks[tsBlockIndex] == null |
| || inputTsBlocks[tsBlockIndex].getPositionCount() == inputIndex[tsBlockIndex]; |
| } |
| |
| /** |
| * merge columns belonging to same series into one column, merge until each input column's time is |
| * larger than currentEndTime. |
| * |
| * @param inputTsBlocks all source TsBlocks, some of which will contain source column |
| * @param inputIndex start index for each source TsBlock and size of it is equal to inputTsBlocks, |
| * we should only read from this array and not update it because others will use the start |
| * index value in inputIndex array |
| * @param updatedInputIndex current index for each source TsBlock after merging |
| * @param timeBuilder result time column, which is already generated and used to indicate each |
| * row's timestamp |
| * @param currentEndTime merge until each input column's time is larger than currentEndTime |
| * @param columnBuilder used to write merged value into |
| */ |
| void mergeColumn( |
| TsBlock[] inputTsBlocks, |
| int[] inputIndex, |
| int[] updatedInputIndex, |
| TimeColumnBuilder timeBuilder, |
| long currentEndTime, |
| ColumnBuilder columnBuilder); |
| |
| /** |
| * merge columns belonging to same series into one column, merge just one row whose time is equal |
| * to currentTime. |
| * |
| * @param inputTsBlocks all source TsBlocks, some of which will contain source column |
| * @param inputIndex start index for each source TsBlock and size of it is equal to inputTsBlocks, |
| * we should only read from this array and not update it because others will use the start |
| * index value in inputIndex array |
| * @param updatedInputIndex current index for each source TsBlock after merging |
| * @param currentTime merge just one row whose time is equal to currentTime |
| * @param columnBuilder used to write merged value into |
| */ |
| void mergeColumn( |
| TsBlock[] inputTsBlocks, |
| int[] inputIndex, |
| int[] updatedInputIndex, |
| long currentTime, |
| ColumnBuilder columnBuilder); |
| } |