Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3585#discussion_r107430676
--- 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)
+
+ lastExpiredRow = windowDataList.get(0)
+
+ windowDataList.remove(0)
+
+ if (windowDataList.size > 0) {
+ dataState.put(expiredDataTs, windowDataList)
+ } else {
+ dataState.remove(expiredDataTs)
+ }
+ }
+
+ var i = 0
+ while (i < forwardedFieldCount) {
+ output.setField(i, input.getField(i))
+ i += 1
+ }
+
+ if (null != lastExpiredRow) {
+ i = 0
+ while (i < aggregates.length) {
+ val accumulator =
accumulators.getField(i).asInstanceOf[Accumulator]
+ val agg = aggregates(i)
+ aggregates(i).retract(accumulator,
lastExpiredRow.getField(aggFields(i)))
+ i += 1
+ }
+ }
+
+ i = 0
+ while (i < aggregates.length) {
+ val index = forwardedFieldCount + i
+ val accumulator =
accumulators.getField(i).asInstanceOf[Accumulator]
+ aggregates(i).accumulate(accumulator,
input.getField(aggFields(i)))
+ output.setField(index, aggregates(i).getValue(accumulator))
+ i += 1
+ }
+ accumulatorState.update(accumulators)
--- End diff --
We only need to update the state once we leave the method.
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