how to select children of a struct with Scan

[j0bekt01]

Describe the usage question you have. Please include as many useful details as possible.

How do you scan nested structs in R? This is what I tried so far but to no avail:
PATH <- "s3 URI path"
df <- arrow::open_dataset(sources=PATH)
scan_builder <- df$NewScan()
Neither of these works.
scan_builder$Project(list(doc_id = Expression$field_ref("document.id")))
scan_builder$Project(list(doc_id = Expression$field_ref("document.id")))

However, if I do:
scan_builder$Project(list(doc_id = Expression$field_ref("document"))) works but I don't want the entire nested object imported into R.

Component(s)

R

[nealrichardson]

In the dev version of the package, you can use $ to reference nested fields in a struct: see #19706

[j0bekt01]

Thank you, sir! Do you know when this will be GA?

[nealrichardson]

Next release is in April, not sure the exact date

[j0bekt01]

awesome! Thank you.