walterddr commented on code in PR #8412: URL: https://github.com/apache/pinot/pull/8412#discussion_r843238050
########## pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/BroadcastJoinOperator.java: ########## @@ -0,0 +1,162 @@ +/** + * 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.query.runtime.operator; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.HashMap; +import java.util.List; +import javax.annotation.Nullable; +import org.apache.pinot.common.utils.DataSchema; +import org.apache.pinot.common.utils.DataTable; +import org.apache.pinot.core.common.Operator; +import org.apache.pinot.core.operator.BaseOperator; +import org.apache.pinot.core.query.selection.SelectionOperatorUtils; +import org.apache.pinot.query.planner.partitioning.KeySelector; +import org.apache.pinot.query.runtime.blocks.DataTableBlock; +import org.apache.pinot.query.runtime.blocks.DataTableBlockUtils; + + +/** + * This basic {@code BroadcastJoinOperator} implement a basic broadcast join algorithm. + * + * <p>It takes the right table as the broadcast side and materialize a hash table. Then for each of the left table row, + * it looks up for the corresponding row(s) from the hash table and create a joint row. + * + * <p>For each of the data block received from the left table, it will generate a joint data block. + */ +public class BroadcastJoinOperator extends BaseOperator<DataTableBlock> { + + private final HashMap<Object, List<Object[]>> _broadcastHashTable; + private final BaseOperator<DataTableBlock> _leftTableOperator; + private final BaseOperator<DataTableBlock> _rightTableOperator; + + private DataSchema _leftTableSchema; + private DataSchema _rightTableSchema; + private int _resultRowSize; + private boolean _isHashTableBuilt; + private KeySelector<Object[], Object> _leftKeySelector; + private KeySelector<Object[], Object> _rightKeySelector; + + public BroadcastJoinOperator(BaseOperator<DataTableBlock> leftTableOperator, + BaseOperator<DataTableBlock> rightTableOperator, KeySelector<Object[], Object> leftKeySelector, + KeySelector<Object[], Object> rightKeySelector) { + // TODO: this assumes right table is broadcast. + _leftKeySelector = leftKeySelector; + _rightKeySelector = rightKeySelector; + _leftTableOperator = leftTableOperator; + _rightTableOperator = rightTableOperator; + _isHashTableBuilt = false; + _broadcastHashTable = new HashMap<>(); + } + + @Override + public String getOperatorName() { + return null; + } + + @Override + public List<Operator> getChildOperators() { + return null; Review Comment: WorkerExecutor uses the StageNode tree to decode the operator chain (or if it is not a chain). so left a comment here. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For additional commands, e-mail: commits-h...@pinot.apache.org
