Jorge Leitão created ARROW-14680:
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Summary: [C++] NullArray should not expect 1 buffer.
Key: ARROW-14680
URL: https://issues.apache.org/jira/browse/ARROW-14680
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Jorge Leitão
When round-tripping over the C data interface, the validation of the NullArray
requests 1 buffer. However, [the specification requires
none|https://arrow.apache.org/docs/format/Columnar.html#null-layout].
This also happens when creating a NullArray - the below errors:
```
import pyarrow
pyarrow.NullArray.from_buffers(pyarrow.null(), 10, [])
> ValueError: Type's expected number of buffers (1) did not match the passed
> number (0).
```
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