[jira] [Created] (ARROW-3478) [C++] API add value / null mask buffer accessor to ArrayData
Wolf Vollprecht created ARROW-3478:
Summary: [C++] API add value / null mask buffer accessor to ArrayData
Project: Apache Arrow
Issue Type: Improvement
Reporter: Wolf Vollprecht
Currently, the ArrayData struct has the `std::vector<Buffer> buffers` member.
The buffers will (from reading the code) either be [null_mask, data] or [data] (if the null mask does not exist).
I'm not sure if there is an easy way to get the null mask reliably at the moment. If I am understanding correctly, the way to do it right now is to check if the vector has one or two elements, and then use `buffers` as the null mask, and `buffers` as the values.
I also did not find information regarding this in the spec. So I am not sure if I can rely on this behavior in future versions of the library.
I am wondering wether adding explicit API for this would make this more reliable.
For example two more interface functions
* `std::shared_ptr<Buffer> mask()`
* `std::shared_ptr<Buffer> values()`
Would make it easy for me to rely on the interface to "do the right thing".
Or am I missing something?
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