[jira] [Commented] (ARROW-14286) [Python][Parquet] Allow to select columns of a list field without requiring the list component names

["Todd Farmer (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-14286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17585509#comment-17585509 ] 

Todd Farmer commented on ARROW-14286:
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This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned per [project policy|https://arrow.apache.org/docs/dev/developers/bug_reports.html#issue-assignment. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

> [Python][Parquet] Allow to select columns of a list field without requiring the list component names
> ----------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-14286
>                 URL: https://issues.apache.org/jira/browse/ARROW-14286
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Joris Van den Bossche
>            Assignee: Joris Van den Bossche
>            Priority: Major
>              Labels: parquet, pull-request-available
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> Subtask for ARROW-14196.
> Currently, if you have a list column, where the list elements itself are nested items (eg a list of structs), selecting a subset of that list column requires something like {{columns=["columnA.list.item.subfield"]}}. While this "list.item" is superfluous, since a list always contains a single child. So ideally we allow to specify this as {{columns=["columnA.subfield"]}}. 
> This also avoids relying on the exact name of the list item (item vs element), for which the default differs between Parquet and Arrow.



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