Richard Wu created ARROW-9096: --------------------------------- 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} -- This message was sent by Atlassian Jira (v8.3.4#803005)