Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3715#discussion_r123225232 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/ProcTimeInnerJoin.scala --- @@ -0,0 +1,316 @@ +/* + * 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.join + +import java.util +import java.util.{List => JList} + +import org.apache.flink.api.common.functions.FlatJoinFunction +import org.apache.flink.api.common.state._ +import org.apache.flink.api.common.typeinfo.{BasicTypeInfo, TypeInformation} +import org.apache.flink.api.java.typeutils.ListTypeInfo +import org.apache.flink.configuration.Configuration +import org.apache.flink.streaming.api.functions.co.CoProcessFunction +import org.apache.flink.table.codegen.Compiler +import org.apache.flink.table.runtime.CRowWrappingCollector +import org.apache.flink.table.runtime.types.CRow +import org.apache.flink.types.Row +import org.apache.flink.util.Collector +import org.slf4j.LoggerFactory + +/** + * A CoProcessFunction to support stream join stream, currently just support inner-join + * + * @param leftStreamWindowSize the left stream window size + * @param rightStreamWindowSize the right stream window size + * @param element1Type the input type of left stream + * @param element2Type the input type of right stream + * @param genJoinFuncName the function code of other non-equi condition + * @param genJoinFuncCode the function name of other non-equi condition + * + */ +class ProcTimeInnerJoin( --- End diff -- Does it make sense to split the implementation into two operators: 1. both streams need to be buffered (`l.ptime > r.ptime - 10.secs AND l.ptime < r.ptime + 5.secs`) 2. only one stream needs to be buffered (`l.ptime > r.ptime - 10.secs AND l.ptime < r.ptime - 5.secs`)
--- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---