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https://issues.apache.org/jira/browse/FLINK-10438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17385414#comment-17385414
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Maciej Bryński commented on FLINK-10438:
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[~pnowojski]
I think this problem is still valid in 2021.
I think we should change return types for following functions when using
DECIMAL as argument.
https://issues.apache.org/jira/browse/FLINK-23472
> Built in functions should document the returned types
> -----------------------------------------------------
>
> Key: FLINK-10438
> URL: https://issues.apache.org/jira/browse/FLINK-10438
> Project: Flink
> Issue Type: Improvement
> Components: Documentation, Table SQL / API
> Affects Versions: 1.6.1
> Reporter: Piotr Nowojski
> Priority: Minor
> Labels: auto-deprioritized-major
>
> As it is now, user have no idea to know whether the result of the operation
> is accurate or not.
> For example {{POWER(4, 2)}} or {{POWER(2.5, )}} could return exact results
> (with proper {{DECIMAL}} support), while it seems like now they are silently
> returning approximated result (because of {{DOUBLE}} arithmetic). Same
> applies to other arithmetic functions, like {{COS SIN ATAN LOG ...}}.
> Such behaviour should be documented. In some cases documenting the argument
> types also might be important.
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