jorisvandenbossche opened a new issue, #51:
URL: https://github.com/apache/arrow-nanoarrow/issues/51
I don't have an easy reproducer since the python bindings are not yet there,
but with this cython function to isolate `ArrowBitCountSet`:
```
def count_valid(arr):
cdef ArrowSchema schema
cdef ArrowArray array
cdef ArrowArrayView array_view
cdef ArrowError error
arr._export_to_c(<uintptr_t> &array, <uintptr_t> &schema)
ArrowArrayViewInitFromSchema(&array_view, &schema, &error)
valid_count = -1
if array_view.layout.buffer_type[0] == NANOARROW_BUFFER_TYPE_VALIDITY:
if array.buffers[0] != NULL:
valid_count = ArrowBitCountSet(<const uint8_t
*>array.buffers[0], 0, array.length)
return valid_count
```
I get:
```
import pyarrow as pa
import nanoarrow
>>> arr = pa.array([1, 2, None, 4, 5, 6, 7])
>>> nanoarrow.count_valid(arr)
0
>>> arr = pa.array([1, 2, None, 4, 5, 6, 7, 8])
>>> nanoarrow.count_valid(arr)
7
```
So it seems that as long the bitmap is max a single byte, it always returns
0 (unless there is something wrong in the way I am calling it?)
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