[jira] [Commented] (ARROW-2177) [C++] Remove support for specifying negative scale values in DecimalType

["Rok Mihevc (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-2177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17659205#comment-17659205 ] 

Rok Mihevc commented on ARROW-2177:
-----------------------------------

This issue has been migrated to [issue #18143|https://github.com/apache/arrow/issues/18143] on GitHub. Please see the [migration documentation|https://github.com/apache/arrow/issues/14542] for further details.

> [C++] Remove support for specifying negative scale values in DecimalType
> ------------------------------------------------------------------------
>
>                 Key: ARROW-2177
>                 URL: https://issues.apache.org/jira/browse/ARROW-2177
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, Python
>    Affects Versions: 0.8.0
>            Reporter: Phillip Cloud
>            Assignee: Phillip Cloud
>            Priority: Major
>             Fix For: 0.9.0
>
>
> Allowing both negative and positive scale makes it ambiguous what the scale of a number should be when it using exponential notation, e.g., {{0.01E3}}. Should that have a precision of 4 and a scale of 2 since it's specified as 2 points to the right of the decimal and it evaluates to 10? Or a precision of 1 and a scale of -1?
> Current it's the latter, but I think it should be the former.



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