[jira] [Resolved] (ARROW-4135) [Python] Can't reload a pandas dataframe containing a list of datetime.time

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-4135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-4135.
---------------------------------
    Resolution: Fixed

Issue resolved by pull request 3289
[https://github.com/apache/arrow/pull/3289]

> [Python] Can't reload a pandas dataframe containing a list of datetime.time 
> ----------------------------------------------------------------------------
>
>                 Key: ARROW-4135
>                 URL: https://issues.apache.org/jira/browse/ARROW-4135
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.11.1
>            Reporter: Krisztian Szucs
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.12.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Ported from https://github.com/apache/arrow/issues/3223
> This simple script writes a panda dataframe with a list of datetime.time. However, constructing back the pandas dataframe fails.
> I initially realised that when doing a pd.read_parquet('example.parquet'), which fails with the same error.
> This is using
> pyarrow 0.11.1
> pandas 0.23.4
> {code}
> import pandas as pd
> import pyarrow as pa
> import pyarrow.parquet as pq
> times = pd.to_datetime(['09:00', '09:30', '10:00', '10:30', '11:00', '11:30', '12:00']).time
> df = pd.DataFrame({'Time': [times]})
> table = pa.Table.from_pandas(df)
> pq.write_table(table, 'example.parquet')
> # works
> table2 = pq.read_table('example.parquet')
> # fails: ArrowNotImplementedError: Not implemented type for list in DataFrameBlock: time64[us]
> df2 = pa.Table.to_pandas(table2)
> {code}



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