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https://issues.apache.org/jira/browse/ARROW-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16216519#comment-16216519
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ASF GitHub Bot commented on ARROW-1689:
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njwhite commented on issue #1233: ARROW-1689 Allow User To Request No Data
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URL: https://github.com/apache/arrow/pull/1233#issuecomment-338913924
@xhochy OK - Travis, &c. are all green now. @wesm thanks - that makes sense.
I'm definitely not looking to do significant work! That said,
[MAP_FIXED](https://stackoverflow.com/questions/10454964/mapping-non-contiguous-blocks-from-a-file-into-contiguous-memory-addresses)
looks like a path to mapping different columns in the Arrow file to a
contiguous address space (i.e. a pre-consolidated block) without physically
copying the data...:)
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> [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
> Labels: pull-request-available
>
> 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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