davidradl commented on code in PR #26313: URL: https://github.com/apache/flink/pull/26313#discussion_r2063520935
########## flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/operators/join/stream/StreamingMultiJoinOperator.java: ########## @@ -0,0 +1,806 @@ +/* + * 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.flink.table.runtime.operators.join.stream; + +import org.apache.flink.streaming.api.operators.AbstractInput; +import org.apache.flink.streaming.api.operators.AbstractStreamOperatorV2; +import org.apache.flink.streaming.api.operators.Input; +import org.apache.flink.streaming.api.operators.MultipleInputStreamOperator; +import org.apache.flink.streaming.api.operators.StreamOperatorParameters; +import org.apache.flink.streaming.api.operators.TimestampedCollector; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.flink.table.data.GenericRowData; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.data.utils.JoinedRowData; +import org.apache.flink.table.runtime.generated.MultiJoinCondition; +import org.apache.flink.table.runtime.operators.join.stream.state.JoinRecordStateView; +import org.apache.flink.table.runtime.operators.join.stream.state.JoinRecordStateViews; +import org.apache.flink.table.runtime.operators.join.stream.utils.JoinInputSideSpec; +import org.apache.flink.table.runtime.typeutils.InternalTypeInfo; +import org.apache.flink.types.RowKind; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; + +/** + * Streaming multi-way join operator which supports inner join and left/right/full outer join. It + * only supports a combination of joins that joins on at least one common column due to + * partitioning. It eliminates the intermediate state necessary for a chain of multiple binary + * joins. In other words, it reduces the total amount of state necessary for chained joins. As of + * time complexity, it performs better in the worst cases where the number of records in the + * intermediate state is large but worst than reordered binary joins when the number of records in Review Comment: It is difficult to read this sentence as it uses worst in 2 senses. Maybe replace the last sentence with : ``` In other words, it reduces the total amount of state necessary for chained joins. As of time complexity, it performs better in cases where the number of records in the intermediate state is large but less well with reordered binary joins and the number of records in the intermediate state is small. ``` -- 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: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
