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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #3889: [FLINK-6075] - Support Limit/Top(Sort) for Stream ...
Date Mon, 15 May 2017 16:43:07 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3889#discussion_r116482838
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/RowTimeSortProcessFunction.scala
---
    @@ -0,0 +1,169 @@
    +/*
    + * 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 org.apache.flink.api.common.state.{ ListState, ListStateDescriptor }
    +import org.apache.flink.api.common.typeinfo.{BasicTypeInfo, TypeInformation}
    +import org.apache.flink.api.java.typeutils.{RowTypeInfo, ListTypeInfo}
    +import org.apache.flink.runtime.state.{ FunctionInitializationContext, FunctionSnapshotContext
}
    +import org.apache.flink.streaming.api.functions.ProcessFunction
    +import org.apache.flink.types.Row
    +import org.apache.flink.util.{ Collector, Preconditions }
    +import org.apache.flink.api.common.state.ValueState
    +import org.apache.flink.api.common.state.ValueStateDescriptor
    +import scala.util.control.Breaks._
    +import org.apache.flink.api.java.tuple.{ Tuple2 => JTuple2 }
    +import org.apache.flink.api.common.state.MapState
    +import org.apache.flink.api.common.state.MapStateDescriptor
    +import org.apache.flink.configuration.Configuration
    +import java.util.Comparator
    +import java.util.ArrayList
    +import java.util.Collections
    +import org.apache.flink.api.common.typeutils.TypeComparator
    +import java.util.{List => JList, ArrayList => JArrayList}
    +import org.apache.flink.table.runtime.types.{CRow, CRowTypeInfo}
    +
    +/**
    + * Process Function used for the aggregate in bounded rowtime sort without offset/fetch
    + * [[org.apache.flink.streaming.api.datastream.DataStream]]
    + *
    + * @param fieldCount Is used to indicate fields in the current element to forward
    + * @param inputType It is used to mark the type of the incoming data
    + * @param rowComparator the [[java.util.Comparator]] is used for this sort aggregation
    + */
    +class RowTimeSortProcessFunction(
    +  private val fieldCount: Int,
    +  private val inputRowType: CRowTypeInfo,
    +  private val rowComparator: CollectionRowComparator)
    +    extends ProcessFunction[CRow, CRow] {
    +
    +  Preconditions.checkNotNull(rowComparator)
    +
    +  private val sortArray: ArrayList[Row] = new ArrayList[Row]
    +  
    +  // the state which keeps all the events that are not expired.
    +  // Each timestamp will contain an associated list with the events 
    +  // received at that timestamp
    +  private var dataState: MapState[Long, JList[Row]] = _
    +
    +    // the state which keeps the last triggering timestamp to filter late events
    +  private var lastTriggeringTsState: ValueState[Long] = _
    +  
    +  private var outputC: CRow = _
    +  
    +  
    +  override def open(config: Configuration) {
    +     
    +    val keyTypeInformation: TypeInformation[Long] =
    +      BasicTypeInfo.LONG_TYPE_INFO.asInstanceOf[TypeInformation[Long]]
    +    val valueTypeInformation: TypeInformation[JList[Row]] = new ListTypeInfo[Row](
    +        inputRowType.asInstanceOf[CRowTypeInfo].rowType)
    +
    +    val mapStateDescriptor: MapStateDescriptor[Long, JList[Row]] =
    +      new MapStateDescriptor[Long, JList[Row]](
    +        "dataState",
    +        keyTypeInformation,
    +        valueTypeInformation)
    +
    +    dataState = getRuntimeContext.getMapState(mapStateDescriptor)
    +    
    +    val lastTriggeringTsDescriptor: ValueStateDescriptor[Long] =
    +      new ValueStateDescriptor[Long]("lastTriggeringTsState", classOf[Long])
    +    lastTriggeringTsState = getRuntimeContext.getState(lastTriggeringTsDescriptor)
    +  }
    +
    +  
    +  override def processElement(
    +    inputC: CRow,
    +    ctx: ProcessFunction[CRow, CRow]#Context,
    +    out: Collector[CRow]): Unit = {
    +
    +     val input = inputC.row
    +    
    +     if( outputC == null) {
    --- End diff --
    
    spaces: `if (outputC == null) {`


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