[jira] [Created] (ARROW-3030) from_pandas() does not respect dtype==category

["Christopher Brooks (JIRA)" <ji...@apache.org>]

Christopher Brooks created ARROW-3030:
-----------------------------------------

             Summary: from_pandas() does not respect dtype==category
                 Key: ARROW-3030
                 URL: https://issues.apache.org/jira/browse/ARROW-3030
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.10.0
            Reporter: Christopher Brooks


While troublehsooting ARROW-2966 I updated my pandas dataframe with more type information. Specifically, I changed some mixed type columns to categorical instead of object. I assumed that the Table.from_pandas() would inspect the pandas type information and respect that when converting it over to a table. It doesn't seem to.

For instance, I expected this code to work, but it throws the same ArrowTypeError as ARROW-2966.

 
{code:java}
import pandas as pd
import pyarrow as pa
import numpy as np
df=pd.DataFrame.from_dict({"col":[0,1,2,3,""]},dtype="category")
tb = pa.Table.from_pandas(df, columns=["col"])
{code}
 



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)