[jira] [Commented] (ARROW-376) Python: Convert non-range Pandas indices (optionally) to Arrow

["Vincent Pham (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15730047#comment-15730047 ] 

Vincent Pham commented on ARROW-376:
------------------------------------

Hi, if this is not taken, I would love to contribute to Apache Arrow. 

> Python: Convert non-range Pandas indices (optionally) to Arrow
> --------------------------------------------------------------
>
>                 Key: ARROW-376
>                 URL: https://issues.apache.org/jira/browse/ARROW-376
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Uwe L. Korn
>            Priority: Minor
>              Labels: newbie
>
> Currently the indices of a Pandas DataFrame are totally ignored on the Pandas to Arrow conversion. We should add an option to also convert the index to an Arrow column if they are not a simple range index.
> The condition for a simple index should be {{isinstance(df.index, pd.RangeIndex) && (df.index._start == 0) && (df.index._stop == len(df.index)) && (df.index._step == 1)}}. In this case, we can always skip the index conversion. Otherwise, a new column in the Arrow table shall be created using the index' name as the name of the column. Additionally there should be some metadata annotation of that column that it is derived of an Pandas Index, so that for roundtrips, we'll use it again as the index of a DataFrame.



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