pitrou opened a new issue, #45819:
URL: https://github.com/apache/arrow/issues/45819
### Describe the enhancement requested
We currently have `BitmapAnd` utility functions that return the conjunction
of two bitmaps.
However, null bitmaps are optional which complicates things when conjoining
two null bitmaps. It would be good to centralize that functionality in a
dedicated utility function, for example:
```c++
ARROW_EXPORT
Result<std::shared_ptr<Buffer>> OptionalBitmapAnd(
MemoryPool* pool,
const std::shared_ptr<Buffer>& left, int64_t left_offset,
const std::shared_ptr<Buffer>& right, int64_t right_offset,
int64_t length, int64_t out_offset);
```
### Component(s)
C++
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