[jira] [Commented] (ARROW-2311) [Python] Struct array slicing defective

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

    [ https://issues.apache.org/jira/browse/ARROW-2311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16400277#comment-16400277 ] 

ASF GitHub Bot commented on ARROW-2311:
---------------------------------------

pitrou opened a new pull request #1754: ARROW-2311: [Python/C++] Fix struct array slicing
URL: https://github.com/apache/arrow/pull/1754
 
 
   `StructArray::field()` would not adjust the offset if the struct array was sliced, requiring error-prone fixup code in the caller.

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> [Python] Struct array slicing defective
> ---------------------------------------
>
>                 Key: ARROW-2311
>                 URL: https://issues.apache.org/jira/browse/ARROW-2311
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, Python
>    Affects Versions: 0.8.0
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>
> {code:python}
> >>> arr = pa.array([(1, 2.0), (3, 4.0), (5, 6.0)], type=pa.struct([pa.field('x', pa.int16()), pa.field('y', pa.float32())]))
> >>> arr
> <pyarrow.lib.StructArray object at 0x7fdfbe7916d8>
> [
>   {'x': 1, 'y': 2.0},
>   {'x': 3, 'y': 4.0},
>   {'x': 5, 'y': 6.0}
> ]
> >>> arr[1:]
> <pyarrow.lib.StructArray object at 0x7fdfbe791f48>
> [
>   {'x': 1, 'y': 2.0},
>   {'x': 3, 'y': 4.0}
> ]
> {code}



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