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

["Phillip Cloud (JIRA)" <ji...@apache.org>]

Phillip Cloud created ARROW-1800:
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             Summary: [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
             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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