[jira] [Resolved] (ARROW-1800) [C++] Fix and simplify random_decimals

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-1800.
---------------------------------
    Resolution: Fixed

Issue resolved by pull request 1306
[https://github.com/apache/arrow/pull/1306]

> [C++] Fix and simplify random_decimals
> --------------------------------------
>
>                 Key: ARROW-1800
>                 URL: https://issues.apache.org/jira/browse/ARROW-1800
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 0.7.1
>            Reporter: Phillip Cloud
>            Assignee: Phillip Cloud
>              Labels: pull-request-available
>             Fix For: 0.8.0
>
>
> {{UniformDecimalDistribution}} currently generates values outside the range specified for the given precision in cases where the number of bytes required to represent a decimal value was less than or equal to 8.
> For example, for a 1 byte value the range is -128, 127 for the low bits and -1, 0 for the high bits. In cases where the low bits generated a negative number and the high bits generated a zero value the number can end up being much larger than desired.
> It's much easier to just generate {{N}} random bytes and sign extend based on the sign bit of the last byte.



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