zanmato1984 commented on issue #39778:
URL: https://github.com/apache/arrow/issues/39778#issuecomment-1908587308
Managed to reproduce with the following UT:
```
TEST(VectorHash, TailByteSafety) {
constexpr int mini_batch_size = 1024;
std::vector<uint32_t> temp_buffer;
temp_buffer.resize(mini_batch_size * 4);
const auto hardware_flags_for_testing = HardwareFlagsForTesting();
ASSERT_GT(hardware_flags_for_testing.size(), 0);
for (int i = 0; i < static_cast<int>(hardware_flags_for_testing.size());
++i) {
const auto hardware_flags = hardware_flags_for_testing[i];
constexpr auto fixed_length = 5;
FixedSizeBinaryBuilder builder(fixed_size_binary(fixed_length));
for (int j = 0; j < 883; ++j) {
ASSERT_OK(builder.Append("12345"));
}
ASSERT_OK_AND_ASSIGN(auto array, builder.Finish());
ASSERT_EQ(array->data()->buffers[1]->capacity(), 4416);
constexpr auto offset = 858;
constexpr auto num_rows = 25;
std::vector<uint32_t> hashes32(num_rows);
Hashing32::HashFixed(hardware_flags,
/*combine_hashes=*/false, num_rows, fixed_length,
array->data()->GetValues<uint8_t>(1) + offset *
fixed_length,
hashes32.data(), temp_buffer.data());
}
}
```
Trying to fix.
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