[jira] [Resolved] (ARROW-2128) [Python] Cannot serialize array of empty lists

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

     [ https://issues.apache.org/jira/browse/ARROW-2128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-2128.
---------------------------------
    Resolution: Fixed

Issue resolved by pull request 1587
[https://github.com/apache/arrow/pull/1587]

> [Python] Cannot serialize array of empty lists
> ----------------------------------------------
>
>                 Key: ARROW-2128
>                 URL: https://issues.apache.org/jira/browse/ARROW-2128
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.8.0
>            Reporter: Uwe L. Korn
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.9.0
>
>
> This currently failing:
> {code:java}
> data = pd.Series([[], [], []])
> arr = pa.array(data)
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> array.pxi:181: in pyarrow.lib.array
> ???
> array.pxi:26: in pyarrow.lib._sequence_to_array
> ???
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> > ???
> E pyarrow.lib.ArrowTypeError: Unable to determine data type
> {code}
> The code in {{SeqVisitor::GetType}} suggests that we don't want to support thus but I would have expected that the above should result in {{List<Null>}}.



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