Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4471#discussion_r152773431
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/join/DataStreamInnerJoin.scala
---
@@ -0,0 +1,285 @@
+/*
+ * 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 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.TupleTypeInfo
+import org.apache.flink.configuration.Configuration
+import org.apache.flink.streaming.api.functions.co.CoProcessFunction
+import org.apache.flink.table.api.{StreamQueryConfig, Types}
+import org.apache.flink.table.runtime.CRowWrappingMultiOuputCollector
+import org.apache.flink.table.runtime.types.CRow
+import org.apache.flink.types.Row
+import org.apache.flink.util.Collector
+import org.apache.flink.api.java.tuple.{Tuple2 => JTuple2}
+import org.slf4j.LoggerFactory
+import org.apache.flink.table.codegen.Compiler
+
+
+/**
+ * Connect data for left stream and right stream. Only use for innerJoin.
+ *
+ * @param leftType the input type of left stream
+ * @param rightType the input type of right stream
+ * @param resultType the output type of join
+ * @param genJoinFuncName the function code of other non-equi condition
+ * @param genJoinFuncCode the function name of other non-equi condition
+ * @param queryConfig the configuration for the query to generate
+ */
+class DataStreamInnerJoin(
+ leftType: TypeInformation[Row],
+ rightType: TypeInformation[Row],
+ resultType: TypeInformation[CRow],
+ genJoinFuncName: String,
+ genJoinFuncCode: String,
+ queryConfig: StreamQueryConfig)
+ extends CoProcessFunction[CRow, CRow, CRow]
+ with Compiler[FlatJoinFunction[Row, Row, Row]] {
+
+ // state to hold left stream element
+ private var leftState: MapState[Row, JTuple2[Int, Long]] = _
+ // state to hold right stream element
+ private var rightState: MapState[Row, JTuple2[Int, Long]] = _
+ private var cRowWrapper: CRowWrappingMultiOuputCollector = _
+
+ private val minRetentionTime: Long =
queryConfig.getMinIdleStateRetentionTime
+ private val maxRetentionTime: Long =
queryConfig.getMaxIdleStateRetentionTime
+ private val stateCleaningEnabled: Boolean = minRetentionTime > 1
+
+ // state to record last timer of left stream, 0 means no timer
+ private var leftTimer: ValueState[Long] = _
+ // state to record last timer of right stream, 0 means no timer
+ private var rightTimer: ValueState[Long] = _
+
+ // other condition function
+ private var joinFunction: FlatJoinFunction[Row, Row, Row] = _
+
+ val LOG = LoggerFactory.getLogger(this.getClass)
+
+ override def open(parameters: Configuration): Unit = {
+ LOG.debug(s"Compiling JoinFunction: $genJoinFuncName \n\n " +
+ s"Code:\n$genJoinFuncCode")
+ val clazz = compile(
+ getRuntimeContext.getUserCodeClassLoader,
+ genJoinFuncName,
+ genJoinFuncCode)
+ LOG.debug("Instantiating JoinFunction.")
+ joinFunction = clazz.newInstance()
+
+ // initialize left and right state, the first element of tuple2
indicates how many rows of
+ // this row, while the second element represents the expired time of
this row.
+ val tupleTypeInfo = new TupleTypeInfo[JTuple2[Int, Long]](Types.INT,
Types.LONG)
+ val leftStateDescriptor = new MapStateDescriptor[Row, JTuple2[Int,
Long]](
+ "left", leftType, tupleTypeInfo)
+ val rightStateDescriptor = new MapStateDescriptor[Row, JTuple2[Int,
Long]](
+ "right", rightType, tupleTypeInfo)
+ leftState = getRuntimeContext.getMapState(leftStateDescriptor)
+ rightState = getRuntimeContext.getMapState(rightStateDescriptor)
+
+ // initialize timer state
+ val valueStateDescriptor1 = new
ValueStateDescriptor[Long]("timervaluestate1", classOf[Long])
+ leftTimer = getRuntimeContext.getState(valueStateDescriptor1)
+ val valueStateDescriptor2 = new
ValueStateDescriptor[Long]("timervaluestate2", classOf[Long])
+ rightTimer = getRuntimeContext.getState(valueStateDescriptor2)
+
+ cRowWrapper = new CRowWrappingMultiOuputCollector()
+ }
+
+ /**
+ * Process left stream records
+ *
+ * @param valueC The input value.
+ * @param ctx The ctx to register timer or get current time
+ * @param out The collector for returning result values.
+ *
+ */
+ override def processElement1(
+ valueC: CRow,
+ ctx: CoProcessFunction[CRow, CRow, CRow]#Context,
+ out: Collector[CRow]): Unit = {
+
+ processElement(valueC, ctx, out, leftTimer, leftState, rightState,
true)
+ }
+
+ /**
+ * Process right stream records
+ *
+ * @param valueC The input value.
+ * @param ctx The ctx to register timer or get current time
+ * @param out The collector for returning result values.
+ *
+ */
+ override def processElement2(
+ valueC: CRow,
+ ctx: CoProcessFunction[CRow, CRow, CRow]#Context,
+ out: Collector[CRow]): Unit = {
+
+ processElement(valueC, ctx, out, rightTimer, rightState, leftState,
false)
+ }
+
+
+ /**
+ * Called when a processing timer trigger.
+ * Expire left/right records which are expired in left and right state.
+ *
+ * @param timestamp The timestamp of the firing timer.
+ * @param ctx The ctx to register timer or get current time
+ * @param out The collector for returning result values.
+ */
+ override def onTimer(
+ timestamp: Long,
+ ctx: CoProcessFunction[CRow, CRow, CRow]#OnTimerContext,
+ out: Collector[CRow]): Unit = {
+
+ if (stateCleaningEnabled && leftTimer.value == timestamp) {
+ expireOutTimeRow(
+ timestamp,
+ leftState,
+ leftTimer,
+ ctx
+ )
+ }
+
+ if (stateCleaningEnabled && rightTimer.value == timestamp) {
+ expireOutTimeRow(
+ timestamp,
+ rightState,
+ rightTimer,
+ ctx
+ )
+ }
+ }
+
+
+ def getNewExpiredTime(
+ curProcessTime: Long,
+ oldExpiredTime: Long): Long = {
+
+ if (stateCleaningEnabled && curProcessTime + minRetentionTime >
oldExpiredTime) {
+ curProcessTime + maxRetentionTime
+ } else {
+ oldExpiredTime
+ }
+ }
+
+ /**
+ * Puts or Retract an element from the input stream into state and
search the other state to
+ * output records meet the condition. Records will be expired in state
if state retention time
+ * has been specified.
+ */
+ def processElement(
+ value: CRow,
+ ctx: CoProcessFunction[CRow, CRow, CRow]#Context,
+ out: Collector[CRow],
+ timerState: ValueState[Long],
+ currentSideState: MapState[Row, JTuple2[Int, Long]],
+ otherSideState: MapState[Row, JTuple2[Int, Long]],
+ isLeft: Boolean): Unit = {
+
+ cRowWrapper.setCollector(out)
+ cRowWrapper.setChange(value.change)
+
+ val curProcessTime = ctx.timerService.currentProcessingTime
+ val oldCntAndExpiredTime = currentSideState.get(value.row)
--- End diff --
This only works given that https://issues.apache.org/jira/browse/FLINK-8139
is fixed.
---
