felipecrv commented on issue #36708:
URL: https://github.com/apache/arrow/issues/36708#issuecomment-1639133737
Found the reason: `AdjustNonNullable` zeroes the validity buffer if
`null_count` is passed as `0`.
```cpp
static inline void AdjustNonNullable(Type::type type_id, int64_t length,
std::vector<std::shared_ptr<Buffer>>*
buffers,
int64_t* null_count) {
if (type_id == Type::NA) {
*null_count = length;
(*buffers)[0] = nullptr;
} else if (internal::HasValidityBitmap(type_id)) {
if (*null_count == 0) {
// In case there are no nulls, don't keep an allocated null bitmap
around
(*buffers)[0] = nullptr;
} else if (*null_count == kUnknownNullCount && buffers->at(0) ==
nullptr) {
// Conversely, if no null bitmap is provided, set the null count to 0
*null_count = 0;
}
} else {
*null_count = 0;
}
}
```
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