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

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

Egill Axfjord Fridgeirsson created ARROW-17543:
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             Summary: [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


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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