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https://issues.apache.org/jira/browse/ARROW-9096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-9096:
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Fix Version/s: 2.0.0
> [Python] Pandas roundtrip with object-dtype column labels with integer
> values: data type "integer" not understood
> -----------------------------------------------------------------------------------------------------------------
>
> 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
> Priority: Minor
> Labels: pull-request-available
> Fix For: 2.0.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> 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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