| /* |
| * 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.schema; |
| |
| import org.apache.iotdb.db.queryengine.common.header.ColumnHeader; |
| import org.apache.iotdb.db.queryengine.common.header.ColumnHeaderConstant; |
| import org.apache.iotdb.db.queryengine.execution.operator.Operator; |
| import org.apache.iotdb.db.queryengine.execution.operator.OperatorContext; |
| import org.apache.iotdb.db.queryengine.execution.operator.process.ProcessOperator; |
| |
| import com.google.common.util.concurrent.ListenableFuture; |
| import org.apache.tsfile.common.conf.TSFileDescriptor; |
| import org.apache.tsfile.enums.TSDataType; |
| import org.apache.tsfile.read.common.block.TsBlock; |
| import org.apache.tsfile.read.common.block.TsBlockBuilder; |
| |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| public class NodePathsCountOperator implements ProcessOperator { |
| |
| private final OperatorContext operatorContext; |
| private final Operator child; |
| private boolean isFinished; |
| private final Set<String> nodePaths; |
| |
| private final List<TSDataType> outputDataTypes; |
| |
| private static final int DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES = |
| TSFileDescriptor.getInstance().getConfig().getMaxTsBlockSizeInBytes(); |
| |
| public NodePathsCountOperator(OperatorContext operatorContext, Operator child) { |
| this.operatorContext = requireNonNull(operatorContext, "operatorContext is null"); |
| this.child = requireNonNull(child, "child operator is null"); |
| this.isFinished = false; |
| this.nodePaths = new HashSet<>(); |
| this.outputDataTypes = |
| ColumnHeaderConstant.countNodesColumnHeaders.stream() |
| .map(ColumnHeader::getColumnType) |
| .collect(Collectors.toList()); |
| } |
| |
| @Override |
| public OperatorContext getOperatorContext() { |
| return operatorContext; |
| } |
| |
| @Override |
| public TsBlock next() throws Exception { |
| while (!child.isFinished()) { |
| // read as much child result as possible |
| ListenableFuture<?> blocked = child.isBlocked(); |
| if (!blocked.isDone()) { |
| return null; |
| } |
| if (child.hasNextWithTimer()) { |
| TsBlock tsBlock = child.nextWithTimer(); |
| if (null != tsBlock && !tsBlock.isEmpty()) { |
| for (int i = 0; i < tsBlock.getPositionCount(); i++) { |
| String path = tsBlock.getColumn(0).getBinary(i).toString(); |
| nodePaths.add(path); |
| } |
| } |
| } |
| } |
| isFinished = true; |
| TsBlockBuilder tsBlockBuilder = new TsBlockBuilder(outputDataTypes); |
| |
| tsBlockBuilder.getTimeColumnBuilder().writeLong(0L); |
| tsBlockBuilder.getColumnBuilder(0).writeLong(nodePaths.size()); |
| tsBlockBuilder.declarePosition(); |
| return tsBlockBuilder.build(); |
| } |
| |
| @Override |
| public boolean hasNext() throws Exception { |
| return !child.isFinished() || !isFinished; |
| } |
| |
| @Override |
| public ListenableFuture<?> isBlocked() { |
| return child.isBlocked(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| child.close(); |
| } |
| |
| @Override |
| public boolean isFinished() throws Exception { |
| return isFinished; |
| } |
| |
| @Override |
| public long calculateMaxPeekMemory() { |
| // todo calculate the result based on all the scan node; currently, this is shadowed by |
| // schemaQueryMergeNode |
| return Math.max(2L * DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES, child.calculateMaxPeekMemory()); |
| } |
| |
| @Override |
| public long calculateMaxReturnSize() { |
| return Math.max(DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES, child.calculateMaxReturnSize()); |
| } |
| |
| @Override |
| public long calculateRetainedSizeAfterCallingNext() { |
| return DEFAULT_MAX_TSBLOCK_SIZE_IN_BYTES + child.calculateRetainedSizeAfterCallingNext(); |
| } |
| } |