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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2017/08/23 15:10:03 UTC

[jira] [Commented] (ARROW-489) Python: Pandas zero-copy for ListArrays conversion

    [ https://issues.apache.org/jira/browse/ARROW-489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16138469#comment-16138469 ] 

Wes McKinney commented on ARROW-489:
------------------------------------

Removed from 0.7.0. We are computing slices in arrow_to_pandas.cc, is there something else that needs to be done here?

> Python: Pandas zero-copy for ListArrays conversion
> --------------------------------------------------
>
>                 Key: ARROW-489
>                 URL: https://issues.apache.org/jira/browse/ARROW-489
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Uwe L. Korn
>
> In the case of the conversion of a list column to a pandas column, currently we always do a copy even though in the numeric case, we could avoid it most of the time. To enable zero-copy conversions, we need to pass a Python reference to a {{pyarrow.Column}} to the {{ConvertColumnToPandas}} inside of {{ConvertListsLike}}. 



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