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https://issues.apache.org/jira/browse/FLINK-3586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15190652#comment-15190652
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Fabian Hueske commented on FLINK-3586:
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FLINK-3596 has been resolved. So intermediate types are no longer exposed to
Calcite and this issue can now be addressed.
> Risk of data overflow while use sum/count to calculate AVG value
> ----------------------------------------------------------------
>
> Key: FLINK-3586
> URL: https://issues.apache.org/jira/browse/FLINK-3586
> Project: Flink
> Issue Type: Sub-task
> Components: Table API
> Reporter: Chengxiang Li
> Priority: Minor
>
> Now, we use {{(sum: Long, count: Long}} to store AVG partial aggregate data,
> which may have data overflow risk, we should use unbounded data type(such as
> BigInteger) to store them for necessary data types.
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