Dewey Dunnington created ARROW-16266:
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Summary: [R] Add StructArray$create()
Key: ARROW-16266
URL: https://issues.apache.org/jira/browse/ARROW-16266
Project: Apache Arrow
Issue Type: Improvement
Components: R
Reporter: Dewey Dunnington
In ARROW-13371 we implemented the {{make_struct}} compute function bound to
{{data.frame()}} / {{tibble()}} in dplyr evaluation; however, we didn't
actually implement {{StructArray$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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