[jira] [Assigned] (ARROW-8779) [R] Implement conversion to List

["Neal Richardson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-8779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson reassigned ARROW-8779:
--------------------------------------

    Assignee: Romain Francois  (was: Neal Richardson)

> [R] Implement conversion to List<Struct>
> ----------------------------------------
>
>                 Key: ARROW-8779
>                 URL: https://issues.apache.org/jira/browse/ARROW-8779
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>    Affects Versions: 0.16.0, 0.17.0
>            Reporter: Dominic Dennenmoser
>            Assignee: Romain Francois
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> It seems there is no method implemented to write a StructArrow (within a TableArrow) to file. A common case would be list columns in a dataframe. If I have understood the documentation correctly, the should be realisable within the current C++ library framework.
> I tested this with the follow df structure:
> {code:none}
> df
> |-- id <column: string>
> |-- data <column: list>
> |   |-- a <column: string>
> |   |-- b <column: integer>
> |   |-- c <column: factor>
> |   |-- d <column: double>{code}
>  I got the follow error message:
> {code:none}
> Error in Table__from_dots(dots, schema) : NotImplemented: Converting vector to arrow type struct<a: string, b: int32, c: dictionary<values=string, indices=int8, ordered=0>, d: double> not implemented{code}
>  I have tried it with {{arrow}} 0.17.0 under {{R}} 3.6.1 .



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