[jira] [Assigned] (ARROW-17543) [R] %in% on an empty vector c() fails

["Egill Axfjord Fridgeirsson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Egill Axfjord Fridgeirsson reassigned ARROW-17543:
--------------------------------------------------

    Assignee: Egill Axfjord Fridgeirsson

> [R] %in% on an empty vector c() fails
> -------------------------------------
>
>                 Key: ARROW-17543
>                 URL: https://issues.apache.org/jira/browse/ARROW-17543
>             Project: Apache Arrow
>          Issue Type: Bug
>    Affects Versions: 9.0.0
>            Reporter: Egill Axfjord Fridgeirsson
>            Assignee: Egill Axfjord Fridgeirsson
>            Priority: Major
>
> When using %in% on empty vectors I'm getting an error
> "Error: Cannot infer type from vector"
> I'd expect this to work the same as base R where you can use %in% on empty vectors.
> The arrow::is_in compute function does accept nulls as the value_set. If I manually create an empty array of type NULL it does work as expected.
> Reprex:
> {code:java}
> library(dplyr)
> library(arrow)
> options(arrow.debug=T)
> #base R
> a <- c(1,2,3)
> b <- c() # NULL
> a %in% b
> #> [1] FALSE FALSE FALSE
> # arrow arrays
> arrowArray <- arrow::Array$create(c(1,2,3))
> arrow::is_in(arrowArray, c())
> #> Error: Cannot infer type from vector
> # define type of c() manually
> arrow::is_in(arrowArray, arrow::Array$create(c(), type=arrow::null()))
> #> Array
> #> <bool>
> #> [
> #>   false,
> #>   false,
> #>   false
> #> ]
> {code}



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