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https://issues.apache.org/jira/browse/ARROW-12792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17346084#comment-17346084
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Nic Crane commented on ARROW-12792:
-----------------------------------
After thinking about this, there are no sensible code-based changes - instead,
I will add examples to the documentation on loading in non-parquet files.
> [R] DatasetFactory could sniff file formats
> -------------------------------------------
>
> Key: ARROW-12792
> URL: https://issues.apache.org/jira/browse/ARROW-12792
> Project: Apache Arrow
> Issue Type: New Feature
> Components: R
> Reporter: Nic Crane
> Assignee: Nic Crane
> Priority: Minor
>
> I was running the following code:
> {code:java}
> tf <- tempfile()
> dir.create(tf)
> on.exit(unlink(tf))
> write_csv_arrow(mtcars[1:5,], file.path(tf, "file1.csv"))
> write_csv_arrow(mtcars[6:11,], file.path(tf, "file2.csv"))
> # ds <- open_dataset(c(file.path(tf, "file1.csv"), file.path(tf,
> "file2.csv")))
> ds <- open_dataset(c(file.path(tf, "file1.csv"), file.path(tf, "file2.csv")),
> schema = Table$create(mtcars)$schema
> )
> {code}
> But when I print the ds object, it reports that the files are Parquet files
> not CSVs
> {code:java}
> > ds
> FileSystemDataset with 2 Parquet files
> mpg: double
> cyl: double
> disp: double
> hp: double
> drat: double
> wt: double
> qsec: double
> vs: double
> am: double
> gear: double
> carb: double{code}
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