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https://issues.apache.org/jira/browse/ARROW-12837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman resolved ARROW-12837.
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Fix Version/s: (was: 6.0.0)
5.0.0
Resolution: Fixed
Issue resolved by pull request 10713
[https://github.com/apache/arrow/pull/10713]
> [C++] Array::ToString() segfaults with null buffer.
> ---------------------------------------------------
>
> Key: ARROW-12837
> URL: https://issues.apache.org/jira/browse/ARROW-12837
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 4.0.0
> Reporter: Alessandro Molina
> Assignee: Alessandro Molina
> Priority: Minor
> Labels: pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> In some tests in the Arrow test suite there are cases where arrays are made
> without allocating real buffers of data, using {{Buffer}} of length 0 and
> with {{nullptr}} as their data.
> In this cases the {{Array::ToString()}} does lead to segfault, at least for
> Int arrays.
> {code}
> * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS
> (code=1, address=0x0)
> frame #0: 0x0000000101dac696
> libarrow.500.dylib`std::__1::enable_if<is_integer_type<arrow::NumericArray<arrow::Int32Type>::TypeClass>::value,
> arrow::Status>::type
> arrow::ArrayPrinter::WriteDataValues<arrow::NumericArray<arrow::Int32Type>
> >(this=0x00007ffeefbfea98, i=0)::'lambda'(long long)::operator()(long long)
> const at pretty_print.cc:152:73
> 149 enable_if_integer<typename T::TypeClass, Status>
> WriteDataValues(const T& array) {
> 150 const auto data = array.raw_values();
> 151 // Need to upcast integers to avoid selecting
> operator<<(char)
> -> 152 WriteValues(array, [&](int64_t i) { (*sink_) <<
> internal::UpcastInt(data[i]); });
> 153 return Status::OK();
> 154 }
> 155
> {code}
> The issue can probably be worked around by checking if the data in the array
> is valid (at least for the most obvious cases, like NULLS or 0-length data)
> when building the string representation
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