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https://issues.apache.org/jira/browse/ARROW-16266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17525992#comment-17525992
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Neal Richardson commented on ARROW-16266:
-----------------------------------------
I think the other use case would be to take Arrays in ... and bind them into a
StructArray.
> [R] Add StructArray$create()
> ----------------------------
>
> Key: ARROW-16266
> URL: https://issues.apache.org/jira/browse/ARROW-16266
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Dewey Dunnington
> Priority: Major
>
> In ARROW-13371 we implemented the {{make_struct}} compute function bound to
> {{data.frame()}} / {{tibble()}} in dplyr evaluation; however, we didn't
> actually implement {{StructArray$create()}}. In ARROW-15168, it turns out
> that we need to do this to support {{StructArray}} creation from data.frames
> whose columns aren't all convertable using the internal C++ conversion. The
> hack used in that PR is below (but we should clearly implement the C++
> function instead of using the hack):
> {code:R}
> library(arrow, warn.conflicts = FALSE)
> struct_array <- function(...) {
> batch <- record_batch(...)
> array_ptr <- arrow:::allocate_arrow_array()
> schema_ptr <- arrow:::allocate_arrow_schema()
> batch$export_to_c(array_ptr, schema_ptr)
> Array$import_from_c(array_ptr, schema_ptr)
> }
> struct_array(a = 1, b = "two")
> #> StructArray
> #> <struct<a: double, b: string>>
> #> -- is_valid: all not null
> #> -- child 0 type: double
> #> [
> #> 1
> #> ]
> #> -- child 1 type: string
> #> [
> #> "two"
> #> ]
> {code}
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