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https://issues.apache.org/jira/browse/ARROW-1895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16281058#comment-16281058
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ASF GitHub Bot commented on ARROW-1895:
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jorisvandenbossche commented on issue #1397: ARROW-1895: [Python] Add
field_name to pandas index metadata
URL: https://github.com/apache/arrow/pull/1397#issuecomment-349800572
Indeed by just constructing it and not getting it as a column from a
dataframe.
Such a dataframe as I show above is constructed in the ipc code to serialize
Series objects:
https://github.com/apache/arrow/blob/1d519d8351c0b26ccb3214116eaf3aa684e4bba0/python/pyarrow/serialization.py#L194-L195
It is also tested explicitly:
https://github.com/apache/arrow/blob/master/python/pyarrow/tests/test_ipc.py#L458
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> [Python] Add field_name to pandas index metadata
> ------------------------------------------------
>
> Key: ARROW-1895
> URL: https://issues.apache.org/jira/browse/ARROW-1895
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.7.1
> Reporter: Phillip Cloud
> Assignee: Phillip Cloud
> Labels: pull-request-available
> Fix For: 0.8.0
>
>
> See the discussion here for details:
> https://github.com/pandas-dev/pandas/pull/18201
> In short we need a way to map index column names to field names in an arrow
> Table.
> Additionally, we're depending on the index columns being written at the end
> of the table and fixing this would allow us to read metadata written by other
> systems (e.g., fastparquet) that don't make this assumption.
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