| /* |
| * 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.common.header; |
| |
| import com.google.common.primitives.Bytes; |
| import org.apache.tsfile.enums.TSDataType; |
| |
| import java.util.ArrayList; |
| import java.util.BitSet; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Objects; |
| |
| /** The header of query result dataset. */ |
| public class DatasetHeader { |
| |
| public static final DatasetHeader EMPTY_HEADER = new DatasetHeader(new ArrayList<>(), false); |
| |
| // column names, data types and aliases of result dataset |
| private final List<ColumnHeader> columnHeaders; |
| |
| // indicate whether the result dataset contain timestamp column |
| private final boolean isIgnoreTimestamp; |
| |
| // map from output column to output tsBlock index |
| private Map<String, Integer> columnToTsBlockIndexMap; |
| |
| // cached field for create response |
| private List<String> respColumns; |
| private List<TSDataType> respDataTypes; |
| private List<String> respDataTypeList; |
| private List<Byte> respAliasColumns; |
| private Map<String, Integer> columnNameIndexMap; |
| private Integer outputValueColumnCount; |
| |
| public DatasetHeader(List<ColumnHeader> columnHeaders, boolean isIgnoreTimestamp) { |
| this.columnHeaders = columnHeaders; |
| this.isIgnoreTimestamp = isIgnoreTimestamp; |
| } |
| |
| public List<ColumnHeader> getColumnHeaders() { |
| return columnHeaders; |
| } |
| |
| public boolean isIgnoreTimestamp() { |
| return isIgnoreTimestamp; |
| } |
| |
| public void setColumnToTsBlockIndexMap(List<String> outputColumnNames) { |
| this.columnToTsBlockIndexMap = new HashMap<>(); |
| for (int i = 0; i < outputColumnNames.size(); i++) { |
| columnToTsBlockIndexMap.put(outputColumnNames.get(i), i); |
| } |
| } |
| |
| public List<String> getRespColumns() { |
| if (respColumns == null) { |
| respColumns = new ArrayList<>(); |
| for (ColumnHeader columnHeader : columnHeaders) { |
| respColumns.add(columnHeader.getColumnNameWithAlias()); |
| } |
| } |
| return respColumns; |
| } |
| |
| public List<TSDataType> getRespDataTypes() { |
| if (respDataTypes == null) { |
| respDataTypes = new ArrayList<>(); |
| for (ColumnHeader columnHeader : columnHeaders) { |
| respDataTypes.add(columnHeader.getColumnType()); |
| } |
| } |
| return respDataTypes; |
| } |
| |
| public List<String> getRespDataTypeList() { |
| if (respDataTypeList == null) { |
| respDataTypeList = new ArrayList<>(); |
| for (ColumnHeader columnHeader : columnHeaders) { |
| respDataTypeList.add(columnHeader.getColumnType().toString()); |
| } |
| } |
| return respDataTypeList; |
| } |
| |
| public List<Byte> getRespAliasColumns() { |
| if (respAliasColumns == null) { |
| BitSet aliasMap = new BitSet(); |
| for (int i = 0; i < columnHeaders.size(); ++i) { |
| if (columnHeaders.get(i).hasAlias()) { |
| aliasMap.set(i); |
| } |
| } |
| respAliasColumns = new ArrayList<>(Bytes.asList(aliasMap.toByteArray())); |
| } |
| return respAliasColumns; |
| } |
| |
| public Map<String, Integer> getColumnNameIndexMap() { |
| if (columnToTsBlockIndexMap == null || columnToTsBlockIndexMap.isEmpty()) { |
| return columnToTsBlockIndexMap; |
| } |
| |
| if (columnNameIndexMap == null) { |
| columnNameIndexMap = new HashMap<>(); |
| for (ColumnHeader columnHeader : columnHeaders) { |
| columnNameIndexMap.put( |
| columnHeader.getColumnNameWithAlias(), |
| columnToTsBlockIndexMap.get(columnHeader.getColumnName())); |
| } |
| } |
| return columnNameIndexMap; |
| } |
| |
| public int getOutputValueColumnCount() { |
| if (outputValueColumnCount == null) { |
| HashSet<String> columnNameSet = new HashSet<>(); |
| for (ColumnHeader columnHeader : columnHeaders) { |
| columnNameSet.add(columnHeader.getColumnName()); |
| } |
| outputValueColumnCount = columnNameSet.size(); |
| } |
| return outputValueColumnCount; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| DatasetHeader that = (DatasetHeader) o; |
| return isIgnoreTimestamp == that.isIgnoreTimestamp && columnHeaders.equals(that.columnHeaders); |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(columnHeaders, isIgnoreTimestamp); |
| } |
| } |