[R] Provide mechanism to write out old format #22902
Description
See ARROW-6474. sparklyr will have the same issue so we should make sure this is supported in R.
Reporter: Neal Richardson / @nealrichardson
Assignee: Romain Francois / @romainfrancois
PRs and other links:
Note: This issue was originally created as ARROW-6539. Please see the migration documentation for further details.