westonpace commented on code in PR #35522:
URL: https://github.com/apache/arrow/pull/35522#discussion_r1190235212
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cpp/src/arrow/scalar.cc:
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@@ -153,9 +153,10 @@ struct ScalarHashImpl {
Status ArrayHash(const ArrayData& a) {
RETURN_NOT_OK(StdHash(a.length) & StdHash(a.GetNullCount()));
- if (a.buffers[0] != nullptr) {
+ if (a.GetNullCount() != 0 && a.buffers[0] != nullptr) {
Review Comment:
IIRC, it's also possible that `a.buffers[0] == nullptr` if all the elements
are valid. Is it possible that we still get differing hashes in this case?
* All elements valid and equal and validity bitmap present (would hash the
validity bitmap)
* All elements valid and equal and validity bitmap missing (would not hash
the validity bitmap)
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