[jira] [Commented] (ARROW-6365) [R] Should be able to coerce numeric to integer with schema

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

    [ https://issues.apache.org/jira/browse/ARROW-6365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922911#comment-16922911 ] 

Neal Richardson commented on ARROW-6365:
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While working on something else, I noticed this test, which suggests that the current behavior is intentional and not just not-yet-implemented: https://github.com/apache/arrow/blob/master/r/tests/testthat/test-Array.R#L390-L398

Thoughts [~romainfrancois]?

> [R] Should be able to coerce numeric to integer with schema
> -----------------------------------------------------------
>
>                 Key: ARROW-6365
>                 URL: https://issues.apache.org/jira/browse/ARROW-6365
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: R
>            Reporter: Neal Richardson
>            Priority: Minor
>             Fix For: 0.15.0
>
>
> R is flexible when it comes to integer vs. floating point, generally obscuring the details inside a "numeric" class, but it knows how to make it seem like my integer-looking data stored in a double is actually integer. This means that an R user can think they have integers even when the underlying storage is not. 
> So I would have expected this to work, and indeed to be one reason I'd want to specify a schema when creating a table:
> {code:r}
> > table(a = 1, schema = schema(a = int32()))
> Error in Table__from_dots(dots, schema) : 
>   Invalid: Cannot convert R vector of type REALSXP to integer Arrow array
> {code}



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