| /* |
| * 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; |
| |
| import org.apache.iotdb.db.queryengine.execution.operator.Operator; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.tsfile.read.common.block.TsBlock; |
| import org.apache.iotdb.tsfile.read.common.block.column.Column; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| |
| import java.util.List; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| public class ProjectOperator implements ProcessOperator { |
| |
| private final OperatorContext operatorContext; |
| |
| private final Operator child; |
| |
| private final List<Integer> remainingColumnIndexList; |
| |
| public ProjectOperator( |
| OperatorContext operatorContext, Operator child, List<Integer> remainingColumnIndexList) { |
| this.operatorContext = requireNonNull(operatorContext, "operatorContext is null"); |
| this.child = requireNonNull(child, "child operator is null"); |
| this.remainingColumnIndexList = |
| requireNonNull(remainingColumnIndexList, "remainingInputLocations is null"); |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| return child.isBlocked(); |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| TsBlock input = child.nextWithTimer(); |
| if (input == null) { |
| return null; |
| } |
| Column[] valueColumns = new Column[remainingColumnIndexList.size()]; |
| for (int i = 0; i < remainingColumnIndexList.size(); i++) { |
| valueColumns[i] = input.getColumn(remainingColumnIndexList.get(i)); |
| } |
| return new TsBlock(input.getPositionCount(), input.getTimeColumn(), valueColumns); |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| return child.hasNextWithTimer(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| child.close(); |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return child.isFinished(); |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| return child.calculateMaxPeekMemory(); |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return child.calculateMaxReturnSize(); |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return child.calculateRetainedSizeAfterCallingNext(); |
| } |
| } |