[R][Compute] ExecPlan_run should return RecordBatchReader instead of Table

[asfimport]

Wrapping a sink node's output as a RecordBatchReader is already supported in c++. Currently a table is returned in R's ExecPlan_run to skirt difficult lifetime considerations, but it'd be more correct to allow streaming batches out of an ExecPlan instead of doing all work before ExecPlan_run returns.

Reporter: Ben Kietzman / @bkietz
Assignee: Ben Kietzman / @bkietz

Related issues:

• [R] Repair map_batches() (is depended upon by)

PRs and other links:

• GitHub Pull Request #11213

_{Note: This issue was originally created as ARROW-14008. Please see the migration documentation for further details.}

[asfimport]

Ben Kietzman / @bkietz:
Issue resolved by pull request 11213
#11213