mqliang commented on a change in pull request #6710: URL: https://github.com/apache/incubator-pinot/pull/6710#discussion_r606099691
########## File path: pinot-core/src/main/java/org/apache/pinot/core/common/datatable/BaseDataTable.java ########## @@ -0,0 +1,283 @@ +/** + * 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.pinot.core.common.datatable; + +import java.io.ByteArrayInputStream; +import java.io.ByteArrayOutputStream; +import java.io.DataInputStream; +import java.io.DataOutputStream; +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.HashMap; +import java.util.Map; +import org.apache.pinot.common.utils.DataSchema; +import org.apache.pinot.common.utils.DataTable; +import org.apache.pinot.common.utils.StringUtil; +import org.apache.pinot.core.common.ObjectSerDeUtils; +import org.apache.pinot.spi.utils.ByteArray; +import org.apache.pinot.spi.utils.BytesUtils; + +import static org.apache.pinot.core.common.datatable.DataTableUtils.decodeString; + + +/** + * Base implementation of the DataTable interface. + */ +public abstract class BaseDataTable implements DataTable { + protected int _numRows; + protected int _numColumns; + protected DataSchema _dataSchema; + protected int[] _columnOffsets; + protected int _rowSizeInBytes; + protected Map<String, Map<Integer, String>> _dictionaryMap; + protected byte[] _fixedSizeDataBytes; + protected ByteBuffer _fixedSizeData; + protected byte[] _variableSizeDataBytes; + protected ByteBuffer _variableSizeData; + protected Map<String, String> _metadata; + + public BaseDataTable(int numRows, DataSchema dataSchema, Map<String, Map<Integer, String>> dictionaryMap, + byte[] fixedSizeDataBytes, byte[] variableSizeDataBytes) { + _numRows = numRows; + _numColumns = dataSchema.size(); + _dataSchema = dataSchema; + _columnOffsets = new int[_numColumns]; + _rowSizeInBytes = DataTableUtils.computeColumnOffsets(dataSchema, _columnOffsets); + _dictionaryMap = dictionaryMap; + _fixedSizeDataBytes = fixedSizeDataBytes; + _fixedSizeData = ByteBuffer.wrap(fixedSizeDataBytes); + _variableSizeDataBytes = variableSizeDataBytes; + _variableSizeData = ByteBuffer.wrap(variableSizeDataBytes); + _metadata = new HashMap<>(); + } + + /** + * Construct empty data table. (Server side) + */ + public BaseDataTable() { + _numRows = 0; + _numColumns = 0; + _dataSchema = null; + _columnOffsets = null; + _rowSizeInBytes = 0; + _dictionaryMap = null; + _fixedSizeDataBytes = null; + _fixedSizeData = null; + _variableSizeDataBytes = null; + _variableSizeData = null; + _metadata = new HashMap<>(); + } + + /** + * Helper method to serialize dictionary map. + */ + protected byte[] serializeDictionaryMap(Map<String, Map<Integer, String>> dictionaryMap) + throws IOException { + ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); + DataOutputStream dataOutputStream = new DataOutputStream(byteArrayOutputStream); + + dataOutputStream.writeInt(dictionaryMap.size()); + for (Map.Entry<String, Map<Integer, String>> dictionaryMapEntry : dictionaryMap.entrySet()) { + String columnName = dictionaryMapEntry.getKey(); + Map<Integer, String> dictionary = dictionaryMapEntry.getValue(); + byte[] bytes = StringUtil.encodeUtf8(columnName); + dataOutputStream.writeInt(bytes.length); + dataOutputStream.write(bytes); + dataOutputStream.writeInt(dictionary.size()); + + for (Map.Entry<Integer, String> dictionaryEntry : dictionary.entrySet()) { + dataOutputStream.writeInt(dictionaryEntry.getKey()); + byte[] valueBytes = StringUtil.encodeUtf8(dictionaryEntry.getValue()); + dataOutputStream.writeInt(valueBytes.length); + dataOutputStream.write(valueBytes); + } + } + + return byteArrayOutputStream.toByteArray(); + } + + /** + * Helper method to deserialize dictionary map. + */ + protected Map<String, Map<Integer, String>> deserializeDictionaryMap(byte[] bytes) + throws IOException { + try (ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes); + DataInputStream dataInputStream = new DataInputStream(byteArrayInputStream)) { + int numDictionaries = dataInputStream.readInt(); + Map<String, Map<Integer, String>> dictionaryMap = new HashMap<>(numDictionaries); + + for (int i = 0; i < numDictionaries; i++) { + String column = decodeString(dataInputStream); + int dictionarySize = dataInputStream.readInt(); + Map<Integer, String> dictionary = new HashMap<>(dictionarySize); + for (int j = 0; j < dictionarySize; j++) { + int key = dataInputStream.readInt(); + String value = decodeString(dataInputStream); + dictionary.put(key, value); + } + dictionaryMap.put(column, dictionary); + } + + return dictionaryMap; + } + } + + public Map<String, String> getMetadata() { Review comment: fixed in https://github.com/apache/incubator-pinot/pull/6738 -- This is an automated message from the Apache Git Service. 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