[ https://issues.apache.org/jira/browse/FLINK-6233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16191896#comment-16191896 ]
ASF GitHub Bot commented on FLINK-6233: --------------------------------------- Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/4625#discussion_r142692599 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/TimeBoundedStreamInnerJoin.scala --- @@ -0,0 +1,410 @@ +/* + * 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.{ArrayList, List => JList} + +import org.apache.flink.api.common.functions.FlatJoinFunction +import org.apache.flink.api.common.state._ +import org.apache.flink.api.common.typeinfo.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.api.Types +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.table.util.Logging +import org.apache.flink.types.Row +import org.apache.flink.util.Collector + +/** + * A CoProcessFunction to execute time-bounded stream inner-join. + * Two kinds of time criteria: + * "L.time between R.time + X and R.time + Y" or "R.time between L.time - Y and L.time - X". + * + * @param leftLowerBound the lower bound for the left stream (X in the criteria) + * @param leftUpperBound the upper bound for the left stream (Y in the criteria) + * @param allowedLateness the lateness allowed for the two streams + * @param leftType the input type of left stream + * @param rightType the input type of right stream + * @param genJoinFuncName the function code of other non-equi conditions + * @param genJoinFuncCode the function name of other non-equi conditions + * + */ +abstract class TimeBoundedStreamInnerJoin( + private val leftLowerBound: Long, + private val leftUpperBound: Long, + private val allowedLateness: Long, + private val leftType: TypeInformation[Row], + private val rightType: TypeInformation[Row], + private val genJoinFuncName: String, + private val genJoinFuncCode: String, + private val leftTimeIdx: Int, --- End diff -- The time indicies are only needed by `RowTimeBoundedStreamInnerJoin`. They can be removed here. > Support rowtime inner equi-join between two streams in the SQL API > ------------------------------------------------------------------ > > Key: FLINK-6233 > URL: https://issues.apache.org/jira/browse/FLINK-6233 > Project: Flink > Issue Type: Sub-task > Components: Table API & SQL > Reporter: hongyuhong > Assignee: Xingcan Cui > > The goal of this issue is to add support for inner equi-join on proc time > streams to the SQL interface. > Queries similar to the following should be supported: > {code} > SELECT o.rowtime , o.productId, o.orderId, s.rowtime AS shipTime > FROM Orders AS o > JOIN Shipments AS s > ON o.orderId = s.orderId > AND o.rowtime BETWEEN s.rowtime AND s.rowtime + INTERVAL '1' HOUR; > {code} > The following restrictions should initially apply: > * The join hint only support inner join > * The ON clause should include equi-join condition > * The time-condition {{o.rowtime BETWEEN s.rowtime AND s.rowtime + INTERVAL > '1' HOUR}} only can use rowtime that is a system attribute, the time > condition only support bounded time range like {{o.rowtime BETWEEN s.rowtime > - INTERVAL '1' HOUR AND s.rowtime + INTERVAL '1' HOUR}}, not support > unbounded like {{o.rowtime < s.rowtime}} , and should include both two > stream's rowtime attribute, {{o.rowtime between rowtime () and rowtime () + > 1}} should also not be supported. > An row-time streams join will not be able to handle late data, because this > would mean in insert a row into a sorted order shift all other computations. > This would be too expensive to maintain. Therefore, we will throw an error if > a user tries to use an row-time stream join with late data handling. > This issue includes: > * Design of the DataStream operator to deal with stream join > * Translation from Calcite's RelNode representation (LogicalJoin). -- This message was sent by Atlassian JIRA (v6.4.14#64029)