[C++][Python] Support for pandas Categoricals with Intervals #30119
Description
Trying to write a pandas categorical created from pd.cut fails with the following error:
df_test = pd.DataFrame({"cat": pd.cut([1, 2, 3, 4, 5], bins=[2, 4])})
df_test.to_parquet("test.parquet")File "pyarrow/error.pxi", line 120, in pyarrow.lib.check_status
pyarrow.lib.ArrowNotImplementedError: Unsupported cast from dictionary<values=extension<pandas.interval<ArrowIntervalType>>, indices=int8, ordered=1> to extension<pandas.interval<ArrowIntervalType>> (no available cast function for target type)The problems seems to be the interval dtype. Specifing the labels keyword solved the problem.
Reporter: Alberto Torres
Related issues:
- [C++][Parquet] Writing DictionaryArrays with ExtensionType to Parquet (relates to)
- [C++] Cast dictionary of extension type to extension type (depends upon)
Note: This issue was originally created as ARROW-14569. Please see the migration documentation for further details.