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https://issues.apache.org/jira/browse/FLINK-8903?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394991#comment-16394991
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lilizhao commented on FLINK-8903:
---------------------------------

Hi, [~fhueske] In my appendix example, the sum of the calculations, the average 
value can be calculated correctly. Only the variance is wrong. I gave the 
sample program and sample data that I finished. Please test it,you will know 
that.

> Error calculation based on rolling window in table API and SQL API
> ------------------------------------------------------------------
>
>                 Key: FLINK-8903
>                 URL: https://issues.apache.org/jira/browse/FLINK-8903
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>    Affects Versions: 1.4.1
>            Reporter: lilizhao
>            Priority: Critical
>             Fix For: 1.5.0
>
>         Attachments: TableAndSQLTest.java
>
>
> Error calculation based on rolling window in table API and SQL API
> The variance of the calculation is equal to the average.
> 1 The test code is detailed in the appendix 
> 2 The test data are as follows
> 1 li
> 100 li
> 3 The Table API test result as follows
> (true,50.5,101.0,50.5,li,2018-03-09 09:11:00.0)
> 4 The SQL API test result as follows
> (true,50.5,2,101.0,50.5,li,2018-03-09 09:21:00.0)
>  



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