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https://issues.apache.org/jira/browse/ARROW-18297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche updated ARROW-18297:
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Summary: [Python] from/to pandas with MultiIndex raises incorrectly (was:
from/to pandas with MultiIndex raises incorrectly)
> [Python] from/to pandas with MultiIndex raises incorrectly
> ----------------------------------------------------------
>
> Key: ARROW-18297
> URL: https://issues.apache.org/jira/browse/ARROW-18297
> Project: Apache Arrow
> Issue Type: Bug
> Reporter: Shoham Debnath
> Priority: Major
>
> The error only throws, when one Index is RangeIndex and the other isn't
> {code:java}
> df = pd.DataFrame({"a":[1,2], "b":[3,4]})
> df = df.set_index(["a"], append=True)
> pa.Table.from_pandas(df).to_pandas()
> Traceback (most recent call last):
> File
> "/Users/debnathshoham/miniconda3/envs/pandas-dev/lib/python3.8/site-packages/IPython/core/interactiveshell.py",
> line 3378, in run_code
> exec(code_obj, self.user_global_ns, self.user_ns)
> File "<ipython-input-121-bf4b7b5f6b6e>", line 1, in <module>
> pa.Table.from_pandas(df).to_pandas()
> File "pyarrow/array.pxi", line 823, in
> pyarrow.lib._PandasConvertible.to_pandas
> File "pyarrow/table.pxi", line 3913, in pyarrow.lib.Table._to_pandas
> File
> "/Users/debnathshoham/miniconda3/envs/pandas-dev/lib/python3.8/site-packages/pyarrow/pandas_compat.py",
> line 808, in table_to_blockmanager
> table, index = _reconstruct_index(table, index_descriptors,
> File
> "/Users/debnathshoham/miniconda3/envs/pandas-dev/lib/python3.8/site-packages/pyarrow/pandas_compat.py",
> line 959, in _reconstruct_index
> result_table, index_level, index_name = _extract_index_level(
> File
> "/Users/debnathshoham/miniconda3/envs/pandas-dev/lib/python3.8/site-packages/pyarrow/pandas_compat.py",
> line 997, in _extract_index_level
> logical_name = field_name_to_metadata[field_name]['name']
> KeyError: 'a' {code}
>
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