[jira] [Resolved] (ARROW-17699) [R] Add better error message for if a non-schema passed into open_dataset()

["Nicola Crane (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicola Crane resolved ARROW-17699.
----------------------------------
    Fix Version/s: 10.0.0
       Resolution: Fixed

Issue resolved by pull request 14108
[https://github.com/apache/arrow/pull/14108]

> [R] Add better error message for if a non-schema passed into open_dataset()
> ---------------------------------------------------------------------------
>
>                 Key: ARROW-17699
>                 URL: https://issues.apache.org/jira/browse/ARROW-17699
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: R
>            Reporter: Nicola Crane
>            Assignee: Nicola Crane
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 10.0.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The issue here comes from accidentally passing in the schema function instead of the created schema object, but the error message isn't helpful
> {code:r}
> library(dplyr)
> desired_schema <- schema(mpg = float64(), disp = float64(), hp = int64(), drat = float64(), 
>     wt = float64(), qsec = float64(), vs = int64(), am = int64(), 
>     gear = int64(), carb = int64(), cyl = int64())
> tf <- tempfile()
> dir.create(tf)
> write_dataset(group_by(mtcars, cyl), tf, format = "csv", hive_style = FALSE)
> open_dataset(tf, format = "csv", schema = schema) %>% collect()
> #> Error in `CsvFileFormat$create()`:
> #> ! Values in `column_names` must match `schema` field names
> #> ✖ `column_names` and `schema` field names match but are not in the same order
> {code}



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