[jira] [Commented] (ARROW-2342) [Python] Aware timestamp type fails pickling

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-2342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16409741#comment-16409741 ] 

ASF GitHub Bot commented on ARROW-2342:
---------------------------------------

pitrou opened a new pull request #1780: ARROW-2342: [Python] Allow pickling more types
URL: https://github.com/apache/arrow/pull/1780
 
 
   Several types (bool, timestamp with a non-None timezone, floats) were unpicklable.
   
   Based on PR #1778.

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> [Python] Aware timestamp type fails pickling
> --------------------------------------------
>
>                 Key: ARROW-2342
>                 URL: https://issues.apache.org/jira/browse/ARROW-2342
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.9.0
>            Reporter: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>
> {code:python}
> >>> ty = pa.timestamp('ms')
> >>> pickle.loads(pickle.dumps(ty))
> TimestampType(timestamp[ms])
> >>> ty = pa.timestamp('ms', tz='UTC')
> >>> pickle.loads(pickle.dumps(ty))
> Traceback (most recent call last):
>   File "<ipython-input-15-889e5adab733>", line 1, in <module>
>     pickle.loads(pickle.dumps(ty))
>   File "types.pxi", line 82, in pyarrow.lib.DataType.__setstate__
>   File "types.pxi", line 1246, in pyarrow.lib.type_for_alias
> ValueError: No type alias for timestamp[ms, tz=utc]
> {code}



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