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Date: Wed, 15 Feb 2017 09:39:41 +0000 (UTC)
From: "Fabian Hueske (JIRA)" <jira@apache.org>
To: issues@flink.apache.org
Message-ID: <JIRA.13038123.1485438729000.85152.1487151581691@Atlassian.JIRA>
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Subject: [jira] [Commented] (FLINK-5657) Add processing time OVER RANGE
 BETWEEN UNBOUNDED PRECEDING aggregation to SQL
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archived-at: Wed, 15 Feb 2017 09:40:02 -0000


    [ https://issues.apache.org/jira/browse/FLINK-5657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15867541#comment-15867541 ] 

Fabian Hueske commented on FLINK-5657:
--------------------------------------

Unfortunately, JIRA does not support nested sub-issues.
I'd suggest to make FLINK-5803 and FLINK-5804 sub-issues of FLINK-4557 and close this issue (after linking it to FLINK-5803 and FLINK-5804 and copying the design sketch).

> Add processing time OVER RANGE BETWEEN UNBOUNDED PRECEDING aggregation to SQL
> -----------------------------------------------------------------------------
>
>                 Key: FLINK-5657
>                 URL: https://issues.apache.org/jira/browse/FLINK-5657
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Fabian Hueske
>            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 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.
> - 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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