[jira] [Commented] (ARROW-1754) [Python] Fix buggy Parquet roundtrip when an index name is the same as a column name

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16285395#comment-16285395 ] 

ASF GitHub Bot commented on ARROW-1754:
---------------------------------------

jorisvandenbossche opened a new pull request #1408: ARROW-1754: [Python] alternative fix for duplicate index/column name that preserves index name if available
URL: https://github.com/apache/arrow/pull/1408
 
 
   Related to the discussion about the pandas metadata specification in https://github.com/pandas-dev/pandas/pull/18201, and an alternative to https://github.com/apache/arrow/pull/1271.
   
   I don't open this PR because it should necessarily be merged, I just want to show that it is not that difficult to both fix [ARROW-1754](https://issues.apache.org/jira/browse/ARROW-1754) and preserve index names as field names when possible (as this was mentioned in https://github.com/pandas-dev/pandas/pull/18201 as the reason to make this change to not preserve index names). 
   The diff is partly a revert of https://github.com/apache/arrow/pull/1271, but then adapted to the current codebase.
   
   Main reasons I prefer to preserve index names: 1) usability in pyarrow itself (if you would want to work with pyarrow Tables created from pandas) and 2) when interchanging parquet files with other people / other non-pandas systems, then it would be much nicer to not have `__index_level_n__` column names if possible.
   

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> [Python] Fix buggy Parquet roundtrip when an index name is the same as a column name
> ------------------------------------------------------------------------------------
>
>                 Key: ARROW-1754
>                 URL: https://issues.apache.org/jira/browse/ARROW-1754
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.7.1
>            Reporter: Wes McKinney
>            Assignee: Phillip Cloud
>              Labels: pull-request-available
>             Fix For: 0.8.0
>
>
> See upstream report https://stackoverflow.com/questions/47013052/issue-with-pyarrow-when-loading-parquet-file-where-index-has-redundant-column



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