[jira] [Commented] (FLINK-5654) Add processing time OVER RANGE BETWEEN x PRECEDING aggregation to SQL

[ASF GitHub Bot (JIRA)]

    [ 
https://issues.apache.org/jira/browse/FLINK-5654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948226#comment-15948226
 ] 

ASF GitHub Bot commented on FLINK-5654:
---------------------------------------

Github user sunjincheng121 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3641#discussion_r108824185
  
    --- Diff: flink-libraries/flink-table/pom.xml ---
    @@ -140,6 +140,20 @@ under the License.
                        <version>${project.version}</version>
                        <scope>test</scope>
                </dependency>
    +           <dependency>
    +                   <groupId>org.apache.flink</groupId>
    +                   <artifactId>flink-streaming-java_2.10</artifactId>
    +                   <version>${project.version}</version>
    +                   <type>test-jar</type>
    +                   <scope>test</scope>
    +           </dependency>
    +           <dependency>
    +                   <groupId>org.apache.flink</groupId>
    +                   <artifactId>flink-runtime_2.10</artifactId>
    +                   <version>${project.version}</version>
    +                   <scope>test</scope>
    +                   <type>test-jar</type>
    +           </dependency>
    --- End diff --
    
    thanks for explanation. @rtudoran @fhueske 


> Add processing time OVER RANGE BETWEEN x PRECEDING aggregation to SQL
> ---------------------------------------------------------------------
>
>                 Key: FLINK-5654
>                 URL: https://issues.apache.org/jira/browse/FLINK-5654
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: Fabian Hueske
>            Assignee: radu
>
> 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 INTERVAL '1' 
> HOUR PRECEDING AND CURRENT ROW) AS sumB,
>   MIN(b) OVER (PARTITION BY c ORDER BY procTime() RANGE BETWEEN INTERVAL '1' 
> HOUR 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 PARTITION BY clause is optional (no partitioning results in single 
> threaded execution).
> - The ORDER BY clause may only have procTime() as parameter. procTime() is a 
> parameterless scalar function that just indicates processing time mode.
> - UNBOUNDED PRECEDING is not supported (see FLINK-5657)
> - 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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