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Posted to issues@arrow.apache.org by "Uwe L. Korn (JIRA)" <ji...@apache.org> on 2018/04/21 07:02:00 UTC

[jira] [Assigned] (ARROW-1731) [Python] Provide for selecting a subset of columns to convert in RecordBatch/Table.from_pandas

     [ https://issues.apache.org/jira/browse/ARROW-1731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Uwe L. Korn reassigned ARROW-1731:
----------------------------------

    Assignee:     (was: Uwe L. Korn)

> [Python] Provide for selecting a subset of columns to convert in RecordBatch/Table.from_pandas
> ----------------------------------------------------------------------------------------------
>
>                 Key: ARROW-1731
>                 URL: https://issues.apache.org/jira/browse/ARROW-1731
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Wes McKinney
>            Priority: Major
>              Labels: beginner
>             Fix For: 0.10.0
>
>
> Currently it's all-or-nothing, and to do the subsetting in pandas incurs a data copy. This would enable columns (by name or index) to be selected out without additional data copying. We should add a {{columns=}} argument to the the {{from_pandas}} calls and do the subsetting when we dispatch the individual arrays for conversion to Arrow.
> cc [~cpcloud] [~jreback]



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