[jira] [Updated] (ARROW-1083) Object categoricals are not serialized when only None is present

["Uwe L. Korn (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-1083?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe L. Korn updated ARROW-1083:
-------------------------------
    Fix Version/s: 0.5.0

> Object categoricals are not serialized when only None is present
> ----------------------------------------------------------------
>
>                 Key: ARROW-1083
>                 URL: https://issues.apache.org/jira/browse/ARROW-1083
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.4.0
>            Reporter: Marco Neumann
>            Priority: Minor
>             Fix For: 0.5.0
>
>
> The following code sample fails with {{pyarrow.lib.ArrowNotImplementedError: NotImplemented: unhandled type}} but should not:
> {noformat}
> import pandas as pd
> import pyarrow as pa
> import pyarrow.parquet as pq
> df = pd.DataFrame({'x': [None]})
> df['x'] = df['x'].astype('category')
> table = pa.Table.from_pandas(df)
> buf = pa.InMemoryOutputStream()
> pq.write_table(table, buf)
> {noformat}



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