[jira] [Commented] (ARROW-12315) [R] add max_partitions argument to write_dataset()

["Matt Matolcsi (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-12315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435101#comment-17435101 ] 

Matt Matolcsi commented on ARROW-12315:
---------------------------------------

Hello, I am running into this issue with Arrow 6.0.0.9000, would it be possible to implement the max_partitions argument for write_dataset()?

Thanks everyone for your hard work on Arrow, it is really great to be able to use it, especially in R.

> [R] add max_partitions argument to write_dataset()
> --------------------------------------------------
>
>                 Key: ARROW-12315
>                 URL: https://issues.apache.org/jira/browse/ARROW-12315
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: R
>    Affects Versions: 3.0.0
>            Reporter: Mauricio 'Pachá' Vargas Sepúlveda
>            Assignee: Mauricio 'Pachá' Vargas Sepúlveda
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 7.0.0
>
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> the Python docs show that we can pass, say, 1025 partitions
> https://arrow.apache.org/docs/_modules/pyarrow/dataset.html
> but in R this argument doesn't exist, it would be good to add this for arrow v4.0.0
> this is useful, for example, with intl trade datasets:
> {code:java}
> # d = UN COMTRADE - World's bilateral flows 2019
> # 13,050,535 x 22 data.frame
> d %>%
>           group_by(Year, `Reporter ISO`, `Partner ISO`) %>%
>           write_dataset("parquet", hive_style = F)
> Error: Invalid: Fragment would be written into 12808 partitions. This exceeds the maximum of 1024
> {code}



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