[jira] [Commented] (ARROW-6414) [Python] pyarrow cannot (de)serialise an empty MultiIndex-ed column DataFrame

["Stephen Gowdy (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-6414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17287799#comment-17287799 ] 

Stephen Gowdy commented on ARROW-6414:
--------------------------------------

What are the replacements? 

> [Python] pyarrow cannot (de)serialise an empty MultiIndex-ed column DataFrame
> -----------------------------------------------------------------------------
>
>                 Key: ARROW-6414
>                 URL: https://issues.apache.org/jira/browse/ARROW-6414
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.14.0
>            Reporter: Stephen Gowdy
>            Priority: Major
>
> If you have an empty multiindex columns in a pandas dataframe pyarrow cannot serialise and deserialise it. Example code is below to show this.
> {code:python}
> import pandas as pd
> import pyarrow as pa
> columns = pd.MultiIndex.from_tuples([('a', 'b', 'c')])
> df = pd.DataFrame(columns = columns)
> df = df[[]]
> pa.deserialize_pandas(pa.serialize_pandas(df).to_pybytes())
> ...
> AttributeError: 'dict' object has no attribute 'dtype'
> {code}



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