amoeba commented on issue #39273:
URL: https://github.com/apache/arrow/issues/39273#issuecomment-1865334304
It makes sense to me to make this work automatically. The analogous call in
PyArrow does, for example:
```python
In [26]: pdf
Out[26]:
letters
0 A
1 B
2 C
In [27]: pa.Table.from_pandas(pdf, schema = pa.schema([('letters',
pa.dictionary(pa.int64
...: (), pa.string()))]))
Out[27]:
pyarrow.Table
letters: dictionary<values=string, indices=int64, ordered=0>
----
letters: [ -- dictionary:
["A","B","C"] -- indices:
[0,1,2]]
```
It looks like the R package has [separate and internal conversion
machinery](https://github.com/apache/arrow/blob/main/r/src/r_to_arrow.cpp) from
PyArrow which uses the [Arrow C++ conversion
utility](https://github.com/apache/arrow/blob/main/cpp/src/arrow/util/converter.h).
Interestingly, the R conversion machinery was added after the C++/Python
pieces were added.
Would it be possible to do the conversion in `r_to_arrow.cpp`?
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