jonkeane commented on code in PR #46124:
URL: https://github.com/apache/arrow/pull/46124#discussion_r2049590299
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cpp/src/arrow/compute/row/compare_internal.cc:
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@@ -276,12 +276,13 @@ void KeyCompare::CompareVarBinaryColumnToRowHelper(
int32_t tail_length = length - j * 8;
uint64_t tail_mask = ~0ULL >> (64 - 8 * tail_length);
uint64_t key_left = 0;
- std::memcpy(&key_left, key_left_ptr + j, tail_length);
+ const uint8_t* src_bytes = reinterpret_cast<const uint8_t*>(key_left_ptr
+ j);
+ std::memcpy(&key_left, src_bytes, tail_length);
uint64_t key_right = key_right_ptr[j];
result_or |= tail_mask & (key_left ^ key_right);
}
int result = result_or == 0 ? 0xff : 0;
- result *= (length_left == length_right ? 1 : 0);
Review Comment:
> With the two concerns above, I wonder if we have a reproducible case for
us to validate our fix?
I assume you're looking for something more than the sanitizer test that is
implemented here? I will admit I'm not super familiar with this area of the
code so have been leaning on the sanitizer failing/passing to tell me if things
are ok (+ passing tests for behavior) but we might be missing coverage.
I'm happy to try other changes if you have any that I should. Or maybe we
make a follow on to investigate why this fix is needed?
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