[R] use RTasks to manage parallel in converting arrow to R

[asfimport]

Reporter: Romain Francois / @romainfrancois
Assignee: Romain Francois / @romainfrancois

Related issues:

• [R] Simplify RTask stop handling (contains)
• [R] use altrep when possible for (RecordBatch, Table) -> data.frame (contains)

PRs and other links:

• GitHub Pull Request #10593

_{Note: This issue was originally created as ARROW-13113. Please see the migration documentation for further details.}

[asfimport]

Jonathan Keane / @jonkeane:
Issue resolved by pull request 10593
#10593