[jira] [Commented] (ARROW-8779) [R] Unable to write Struct Layout to file (.arrow, .parquet)

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

    [ https://issues.apache.org/jira/browse/ARROW-8779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17105733#comment-17105733 ] 

Neal Richardson commented on ARROW-8779:
----------------------------------------

Could you please provide a minimal reproducible example?

> [R] Unable to write Struct Layout to file (.arrow, .parquet)
> ------------------------------------------------------------
>
>                 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
>            Priority: Major
>              Labels: features, patch
>
> 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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