Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/3585#discussion_r107429893 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/RowsClauseBoundedOverProcessFunction.scala --- @@ -0,0 +1,207 @@ +/* + * 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.aggregate + +import java.util.{ArrayList, List => JList} + +import org.apache.flink.api.common.state._ +import org.apache.flink.api.java.typeutils.RowTypeInfo +import org.apache.flink.configuration.Configuration +import org.apache.flink.streaming.api.functions.ProcessFunction +import org.apache.flink.table.functions.{Accumulator, AggregateFunction} +import org.apache.flink.types.Row +import org.apache.flink.util.{Collector, Preconditions} + +/** + * Process Function for ROWS clause event-time bounded OVER window + * + * @param aggregates the list of all [[org.apache.flink.table.functions.AggregateFunction]] + * used for this aggregation + * @param aggFields the position (in the input Row) of the input value for each aggregate + * @param forwardedFieldCount the count of forwarded fields. + * @param aggregationStateType the row type info of aggregation + * @param precedingOffset the preceding offset + */ +class RowsClauseBoundedOverProcessFunction( + private val aggregates: Array[AggregateFunction[_]], + private val aggFields: Array[Int], + private val forwardedFieldCount: Int, + private val aggregationStateType: RowTypeInfo, + private val precedingOffset: Int) + extends ProcessFunction[Row, Row] { + + Preconditions.checkNotNull(aggregates) + Preconditions.checkNotNull(aggFields) + Preconditions.checkArgument(aggregates.length == aggFields.length) + Preconditions.checkNotNull(forwardedFieldCount) + Preconditions.checkNotNull(aggregationStateType) + Preconditions.checkNotNull(precedingOffset) + + private var output: Row = _ + + // the state which keeps the last triggering timestamp + private var lastTriggeringTsState: ValueState[Long] = _ + + // the state which keeps the count of data + private var dataCountState: ValueState[Long] = null + + // the state which used to materialize the accumulator for incremental calculation + private var accumulatorState: ValueState[Row] = _ + + // the state which keeps all the data that are not expired. + // The first element (as the mapState key) of the tuple is the time stamp. Per each time stamp, + // the second element of tuple is a list that contains the entire data of all the rows belonging + // to this time stamp. + private var dataState: MapState[Long, JList[Row]] = _ + + override def open(config: Configuration) { + + output = new Row(forwardedFieldCount + aggregates.length) + + + val lastTriggeringTsDescriptor: ValueStateDescriptor[Long] = + new ValueStateDescriptor[Long]("lastTriggeringTsState", classOf[Long]) + lastTriggeringTsState = getRuntimeContext.getState(lastTriggeringTsDescriptor) + + val dataCountStateDescriptor = + new ValueStateDescriptor[Long]("dataCountState", classOf[Long]) + dataCountState = getRuntimeContext.getState(dataCountStateDescriptor) + + val accumulatorStateDescriptor = + new ValueStateDescriptor[Row]("accumulatorState", aggregationStateType) + accumulatorState = getRuntimeContext.getState(accumulatorStateDescriptor) + + val mapStateDescriptor: MapStateDescriptor[Long, JList[Row]] = + new MapStateDescriptor[Long, JList[Row]]( + "dataState", + classOf[Long], + classOf[JList[Row]]) + + dataState = getRuntimeContext.getMapState(mapStateDescriptor) + + } + + override def processElement( + input: Row, + ctx: ProcessFunction[Row, Row]#Context, + out: Collector[Row]): Unit = { + + // triggering timestamp for trigger calculation + val triggeringTs = ctx.timestamp + + val lastTriggeringTs = lastTriggeringTsState.value + // check if the data is expired, if not, save the data and register event time timer + if (triggeringTs > lastTriggeringTs && triggeringTs > ctx.timerService.currentWatermark) { + if (dataState.contains(triggeringTs)) { + val data = dataState.get(triggeringTs) + data.add(input) + dataState.put(triggeringTs, data) + } else { + val data = new ArrayList[Row] + data.add(input) + dataState.put(triggeringTs, data) + // register event time timer + ctx.timerService.registerEventTimeTimer(triggeringTs) + } + } + } + + override def onTimer( + timestamp: Long, + ctx: ProcessFunction[Row, Row]#OnTimerContext, + out: Collector[Row]): Unit = { + + // gets all window data from state for the calculation + val inputs: JList[Row] = dataState.get(timestamp) + if (null != inputs) { + var j: Int = 0 + while (j < inputs.size) { + val input = inputs.get(j) + var accumulators = accumulatorState.value + + // initialize when first run or failover recovery per key + if (null == accumulators) { + accumulators = new Row(aggregates.length) + var i = 0 + while (i < aggregates.length) { + accumulators.setField(i, aggregates(i).createAccumulator) + i += 1 + } + } + + var dataCount = dataCountState.value + 1 + dataCountState.update(dataCount) + + var lastExpiredRow: Row = null + + if (dataCount > precedingOffset) { + val dataTimestampIt = dataState.keys.iterator + var expiredDataTs: Long = Long.MaxValue + while (dataTimestampIt.hasNext) { + val dataTs = dataTimestampIt.next + if (dataTs < expiredDataTs) { + expiredDataTs = dataTs + } + } + val windowDataList = dataState.get(expiredDataTs) --- End diff -- Rename to `retractList`?
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