Wes McKinney created ARROW-3790:
-----------------------------------
Summary: [C++] Signed to unsigned integer cast yields incorrect
results when type sizes are the same
Key: ARROW-3790
URL: https://issues.apache.org/jira/browse/ARROW-3790
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Wes McKinney
Fix For: 0.12.0
In
https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernels/cast.cc#L239,
an {{int32_t}} is overflows in
{code}
constexpr in_type kMax =
static_cast<in_type>(std::numeric_limits<out_type>::max());
{code}
resulting in safety checks not being correctly performed
{code}
In [2]: arr = pa.array([-1, -2, -3], type='int32')
In [3]: arr.cast('uint32')
Out[3]:
<pyarrow.lib.UInt32Array object at 0x7f4889457b88>
[
4294967295,
4294967294,
4294967293
]
{code}
This would be expected to error when {{safe=True}}
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