Hello Felipe,

it's a bit per value as per memory layout documentation.

François



On Fri, Mar 22, 2019 at 10:48 AM Felipe Aramburu <fel...@blazingdb.com>
wrote:

> In the builder base class I see this api
>
>
> https://github.com/apache/arrow/blob/ad1697e5d25eeaff5630421f55b0120f45cf0ce1/cpp/src/arrow/array/builder_base.h#L149
>
>     // Vector append. Treat each zero byte as a nullzero. If valid_bytes is
> null
>     // assume all of length bits are valid.
>     void UnsafeAppendToBitmap(const uint8_t* valid_bytes, int64_t length)
>
> Is valid_bytes an allocation of size (int8_t) * length, using an entire
> byte to indicate validity for each element in the array or is this a null
> bitmask where in each byte in valid_bytes encodes 8 values, one per bit?
>
> If this is using a byte per value is there an approved way of using a
> builder to initialize an array using the memory layout described here
> https://arrow.apache.org/docs/memory_layout.html#null-bitmaps?
>

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