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

["sunjincheng (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-5803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869420#comment-15869420 ] 

sunjincheng commented on FLINK-5803:
------------------------------------

Hi,guys，I made a preliminary implementation of this JIRA.
My approach is:
1. Calcite -> Flink
"LogicalProject with RexOver expression" – (normalize rule) -> "Calcite's LogicalWindow" – (opt rule) -> DataStreamRowWindowAggregate
2. datastreamAPI:(With partitionBy situation): 
approach1: inputDS.map().keyBy().reduce().map() //we prefer this approach, because we can use the current reduce state.
approach2: inputDS.map().keyBy().process()
3. About OrderBy:
According to the natural order of elements, procTime () use for generate end-time of the window and guaranteed pass the sql validation.

> 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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