lidavidm opened a new issue, #14855:
URL: https://github.com/apache/arrow/issues/14855
The zero-case union is apparently not supported by Arrow C++'s C
Data interface. I get:
```
'arrow_type' failed with Invalid: Invalid or unsupported format string:
'+us:'
```
Reproducer for Python:
```python
import pyarrow as pa
from pyarrow.cffi import ffi
empty_union = pa.sparse_union([])
ptr = ffi.new("struct ArrowSchema*")
empty_union._export_to_c(int(ffi.cast("uintptr_t", ptr)))
pa.DataType._import_from_c(int(ffi.cast("uintptr_t", ptr)))
# Traceback (most recent call last):
# File "<stdin>", line 1, in <module>
# File "pyarrow/types.pxi", line 248, in
pyarrow.lib.DataType._import_from_c
# File "pyarrow/error.pxi", line 144, in
pyarrow.lib.pyarrow_internal_check_status
# File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
# pyarrow.lib.ArrowInvalid: Invalid or unsupported format string: '+us:'
```
_Originally posted by @paleolimbot in
https://github.com/apache/arrow-nanoarrow/pull/81#discussion_r1041055778_
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