jonkeane commented on code in PR #46124:
URL: https://github.com/apache/arrow/pull/46124#discussion_r2049633851
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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:
Ah! Here is a link to that same failing build:
https://github.com/ursacomputing/crossbow/actions/runs/14459183248/job/40548479728#step:7:5379
The test that triggers that is
https://github.com/apache/arrow/blob/cc56a5e78eeede2715f12b6ca61ebea741f38f60/r/tests/testthat/test-dataset-dplyr.R#L183-L196
so that _should_ trigger it for you if that's helpful.
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