[R] Handle Dataset schema metadata in ExecPlan #29473
Description
See #10992 (comment). Scanner would preserve the schema metadata but ExecPlan does not, and that makes sense in the general case. But this may result in unexpected behavior in R where we keep R attributes in the schema metadata.
We could probably determine in ExecPlan$Build which fields in the resulting Table are just carried forward from the underlying Dataset and pull in metadata for them to the result.
Reporter: Neal Richardson / @nealrichardson
Assignee: Neal Richardson / @nealrichardson
PRs and other links:
Note: This issue was originally created as ARROW-13852. Please see the migration documentation for further details.