Richard Wu created ARROW-9096:
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Summary: data type "integer" not understood: pandas roundtrip
Key: ARROW-9096
URL: https://issues.apache.org/jira/browse/ARROW-9096
Project: Apache Arrow
Issue Type: Bug
Components: Python
Affects Versions: 0.17.1
Reporter: Richard Wu
The following will fail the roundtrip since the column indexes' pandas_type is
converted from int64 to integer when an additional column is introduced and
subsequently moved to the index:
{code:java}
df = pd.DataFrame(np.ones((3,1), index=[[1,2,3]])
df['foo'] = np.arange(3)
df = df.set_index('foo', append=True)
table = pyarrow.Table.from_pandas(df)
table.to_pandas() # Errors{code}
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