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Posted to issues@flink.apache.org by "Piotr Nowojski (JIRA)" <ji...@apache.org> on 2018/09/26 13:14:00 UTC

[jira] [Updated] (FLINK-10438) Built in functions should document the returned types

     [ https://issues.apache.org/jira/browse/FLINK-10438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Piotr Nowojski updated FLINK-10438:
-----------------------------------
    Description: 
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.

  was:
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 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.


> 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: Table API &amp; SQL
>    Affects Versions: 1.6.1
>            Reporter: Piotr Nowojski
>            Priority: 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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