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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #4380: Time sort with offset/fetch without retraction
Date Thu, 27 Jul 2017 13:33:30 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4380#discussion_r129832039
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/ProcTimeIdentitySortProcessFunctionOffsetFetch.scala
---
    @@ -0,0 +1,110 @@
    +/*
    + * 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.java.typeutils.RowTypeInfo
    +import org.apache.flink.configuration.Configuration
    +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.api.common.typeinfo.TypeInformation
    +import org.apache.flink.api.java.typeutils.ListTypeInfo
    +import java.util.Comparator
    +import java.util.ArrayList
    +import java.util.Collections
    +import org.apache.flink.api.common.typeutils.TypeComparator
    +import org.apache.flink.table.runtime.types.{CRow, CRowTypeInfo}
    +
    +/**
    + * Process Function used for the sort based solely on proctime with offset/fetch
    + * [[org.apache.flink.streaming.api.datastream.DataStream]]
    + *
    + * @param offset Is used to indicate the number of elements to be skipped in the current
context
    + * (0 offset allows to execute only fetch)
    + * @param fetch Is used to indicate the number of elements to be outputted in the current
context
    + * @param inputType It is used to mark the type of the incoming data
    + */
    +class ProcTimeIdentitySortProcessFunctionOffsetFetch(
    +  private val offset: Int,
    +  private val fetch: Int,
    +  private val inputRowType: CRowTypeInfo)
    +    extends ProcessFunction[CRow, CRow] {
    +
    +  private var stateEventsBuffer: ListState[Row] = _
    +  
    +  private var outputC: CRow = _
    +  private val adjustedFetchLimit = offset + fetch
    +  
    +  override def open(config: Configuration) {
    +    val sortDescriptor = new ListStateDescriptor[Row]("sortState",
    +        inputRowType.asInstanceOf[CRowTypeInfo].rowType)
    +    stateEventsBuffer = getRuntimeContext.getListState(sortDescriptor)
    +
    +    val arity:Integer = inputRowType.getArity
    --- End diff --
    
    +space `arity: Integer`


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