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

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/25251
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 15/Jun/20 22:56
• Updated: 11/Jan/23 08:04
• Resolved: 18/Jun/20 00:35

Description

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).