Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3715#discussion_r123209008 --- 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( + private val leftStreamWindowSize: Long, + private val rightStreamWindowSize: Long, + private val element1Type: TypeInformation[Row], + private val element2Type: TypeInformation[Row], + private val genJoinFuncName: String, + private val genJoinFuncCode: String) + extends CoProcessFunction[CRow, CRow, CRow] + with Compiler[FlatJoinFunction[Row, Row, Row]]{ + + private var cRowWrapper: CRowWrappingCollector = _ + + /** other condition function **/ + private var joinFunction: FlatJoinFunction[Row, Row, Row] = _ + + /** tmp list to store expired records **/ + private var listToRemove: JList[Long] = _ + + /** state to hold left stream element **/ + private var row1MapState: MapState[Long, JList[Row]] = _ + /** state to hold right stream element **/ + private var row2MapState: MapState[Long, JList[Row]] = _ + + /** state to record last timer of left stream, 0 means no timer **/ + private var timerState1: ValueState[Long] = _ + /** state to record last timer of right stream, 0 means no timer **/ + private var timerState2: ValueState[Long] = _ + + val LOG = LoggerFactory.getLogger(this.getClass) + override def open(config: Configuration) { --- End diff -- add a new line before the method
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