jonmmease commented on issue #39539:
URL: https://github.com/apache/arrow/issues/39539#issuecomment-2014943808
Let me know if you think this is a distinct issue, but I ran into a
different error message when converting a Date32 from Polars through the
DataFrame interchange protocol.
```python
import datetime
import polars as pl
from pyarrow.interchange import from_dataframe
from_dataframe(pl.DataFrame({"date": [datetime.date(2024, 3, 22)]}))
```
```
---------------------------------------------------------------------------
NotImplementedError Traceback (most recent call last)
...
File
[.../envs/default/lib/python3.11/site-packages/pyarrow/interchange/from_dataframe.py:563]
in validity_buffer_nan_sentinel(data_pa_buffer, data_type, describe_null,
length, offset, allow_copy)
537 """
538 Build a PyArrow buffer from NaN or sentinel values.
539
(...)
560 pa.Buffer
561 """
562 kind, bit_width, _, _ = data_type
--> 563 data_dtype = map_date_type(data_type)
564 null_kind, sentinel_val = describe_null
566 # Check for float NaN values
File
[...envs/default/lib/python3.11/site-packages/pyarrow/interchange/from_dataframe.py:332](http://localhost:8889/lab/workspaces/auto-z/tree/scratch/bugs/~/VegaFusion/repos/altair/.pixi/envs/default/lib/python3.11/site-packages/pyarrow/interchange/from_dataframe.py#line=331),
in map_date_type(data_type)
329 kind, bit_width, f_string, _ = data_type
331 if kind == DtypeKind.DATETIME:
--> 332 unit, tz = parse_datetime_format_str(f_string)
333 return pa.timestamp(unit, tz=tz)
334 else:
File
[.../envs/default/lib/python3.11/site-packages/pyarrow/interchange/from_dataframe.py:324](http://localhost:8889/lab/workspaces/auto-z/tree/scratch/bugs/~/VegaFusion/repos/altair/.pixi/envs/default/lib/python3.11/site-packages/pyarrow/interchange/from_dataframe.py#line=323),
in parse_datetime_format_str(format_str)
320 unit += "s"
322 return unit, tz
--> 324 raise NotImplementedError(f"DateTime kind is not supported:
{format_str}")
NotImplementedError: DateTime kind is not supported: tdD
```
What's the current thinking on the best way forward to support this?
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