Closed
Description
The code now uses NumPy format strings, while the docs for Column.dtype specify it must use the format string from the Apache Arrow C Data Interface (similar but slightly different). So we need a utility to map NumPy to Arrow format here.
Example - should say 'b' not |b1':
df = pd.DataFrame({"A": [True, False, False, True]})
>>> df.__dataframe__().get_column_by_name('A').dtype
(<_DtypeKind.BOOL: 20>, 8, '|b1', '|')Source:
https://arrow.apache.org/docs/format/CDataInterface.html#data-type-description-format-strings
https://numpy.org/doc/stable/reference/arrays.interface.html#arrays-interface
https://numpy.org/doc/stable/reference/generated/numpy.dtype.itemsize.html
https://numpy.org/doc/stable/reference/generated/numpy.dtype.byteorder.html