[jira] [Commented] (FLINK-5803) Add [partitioned] processing time OVER RANGE BETWEEN UNBOUNDED PRECEDING aggregation to SQL

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-5803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15889745#comment-15889745 ] 

ASF GitHub Bot commented on FLINK-5803:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3397#discussion_r103631287
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/aggregate/UnboundedProcessingOverProcessFunction.scala ---
    @@ -0,0 +1,104 @@
    +/*
    + * 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
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    + * "License"); you may not use this file except in compliance
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    + *     http://www.apache.org/licenses/LICENSE-2.0
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    +package org.apache.flink.table.runtime.aggregate
    +
    +import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.configuration.Configuration
    +import org.apache.flink.streaming.api.functions.ProcessFunction.{Context, OnTimerContext}
    +import org.apache.flink.types.Row
    +import org.apache.flink.streaming.api.functions.RichProcessFunction
    +import org.apache.flink.util.{Collector, Preconditions}
    +import org.apache.flink.api.common.typeutils.TypeSerializer
    +import org.apache.flink.api.common.state.ValueStateDescriptor
    +import org.apache.flink.api.java.typeutils.RowTypeInfo
    +import org.apache.flink.api.common.state.ValueState
    +import org.apache.flink.api.java.typeutils.runtime.RowSerializer
    +
    +class UnboundedProcessingOverProcessFunction(
    +    private val aggregates: Array[Aggregate[_]],
    +    private val projectionsMapping: Array[(Int, Int)],
    +    private val aggregateMapping: Array[(Int, Int)],
    +    private val  intermediateRowType: RowTypeInfo,
    +  @transient private val returnType: TypeInformation[Row])
    +  extends RichProcessFunction[Row, Row]{
    +
    +  protected var stateSerializer: TypeSerializer[Row] = _
    +  protected var stateDescriptor: ValueStateDescriptor[Row] = _
    +
    +  private var output: Row = _
    +  private var state: ValueState[Row] = _
    +
    +  override def open(config: Configuration) {
    +    Preconditions.checkNotNull(aggregates)
    +    Preconditions.checkNotNull(projectionsMapping)
    +    Preconditions.checkNotNull(aggregateMapping)
    +    Preconditions.checkArgument(aggregates.length == aggregateMapping.length)
    +
    +    val finalRowLength: Int = projectionsMapping.length + aggregateMapping.length
    +    output = new Row(finalRowLength)
    +    stateSerializer = intermediateRowType.createSerializer(getRuntimeContext.getExecutionConfig)
    +    stateDescriptor = new ValueStateDescriptor[Row]("overState", stateSerializer)
    --- End diff --
    
    Oh, I see. Wasn't aware of this change. Then let's keep it as it is.


> Add [partitioned] processing time OVER RANGE BETWEEN UNBOUNDED PRECEDING aggregation to SQL
> -------------------------------------------------------------------------------------------
>
>                 Key: FLINK-5803
>                 URL: https://issues.apache.org/jira/browse/FLINK-5803
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>
> The goal of this issue is to add support for OVER RANGE aggregations on processing time streams to the SQL interface.
> Queries similar to the following should be supported:
> {code}
> SELECT 
>   a, 
>   SUM(b) OVER (PARTITION BY c ORDER BY procTime() RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS sumB,
>   MIN(b) OVER (PARTITION BY c ORDER BY procTime() RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS minB
> FROM myStream
> {code}
> The following restrictions should initially apply:
> - All OVER clauses in the same SELECT clause must be exactly the same.
> - The ORDER BY clause may only have procTime() as parameter. procTime() is a parameterless scalar function that just indicates processing time mode.
> - bounded PRECEDING is not supported (see FLINK-5654)
> - FOLLOWING is not supported.
> The restrictions will be resolved in follow up issues. If we find that some of the restrictions are trivial to address, we can add the functionality in this issue as well.
> This issue includes:
> - Design of the DataStream operator to compute OVER ROW aggregates
> - Translation from Calcite's RelNode representation (LogicalProject with RexOver expression).



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