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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