[jira] [Resolved] (ARROW-9142) [C++] random::RandomArrayGenerator::Boolean "probability" misdocumented / incorrect

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

     [ https://issues.apache.org/jira/browse/ARROW-9142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-9142.
---------------------------------
    Resolution: Fixed

I did this in https://github.com/apache/arrow/commit/d0f3b5f3c74f67c7ca941c98bd60148e9a9e94f0

> [C++] random::RandomArrayGenerator::Boolean "probability" misdocumented / incorrect
> -----------------------------------------------------------------------------------
>
>                 Key: ARROW-9142
>                 URL: https://issues.apache.org/jira/browse/ARROW-9142
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Wes McKinney
>            Priority: Major
>             Fix For: 1.0.0
>
>
> I would expect {{rng.Boolean(length, 0.99)}} to generate an array that is 99% "true" on average. 
> The docs say "/// \param[in] probability the estimated number of active bits", but this is not what the function does (the opposite, actually). 



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