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

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

     [ https://issues.apache.org/jira/browse/ARROW-14286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-14286:
-----------------------------------
    Labels: parquet pull-request-available  (was: parquet)

> [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: 10m
>  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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