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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2017/10/19 13:10:00 UTC

[jira] [Commented] (ARROW-1689) [Python] Categorical Indices Should Be Zero-Copy

    [ https://issues.apache.org/jira/browse/ARROW-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16211005#comment-16211005 ] 

Wes McKinney commented on ARROW-1689:
-------------------------------------

True (but only if there are no nulls). 

> [Python] Categorical Indices Should Be Zero-Copy
> ------------------------------------------------
>
>                 Key: ARROW-1689
>                 URL: https://issues.apache.org/jira/browse/ARROW-1689
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>    Affects Versions: 0.7.1
>            Reporter: Nick White
>
> It seems like [WriteIndices|https://github.com/apache/arrow/blob/0c8b861f93884f2868eb631d8fceee3a8b8905ec/cpp/src/arrow/python/arrow_to_pandas.cc#L955-L981] could reuse some of the logic in [ConvertValuesZeroCopy|https://github.com/apache/arrow/blob/0c8b861f93884f2868eb631d8fceee3a8b8905ec/cpp/src/arrow/python/arrow_to_pandas.cc#L1348-L1385] to avoid copying the integer indices array?



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