Commits
David Li authored b73bcf0a0dd
ARROW-12597: [C++] Enable per-row-group parallelism in async Parquet reader This adds an OptionalParallelForAsync which lets us have per-row-group parallelism without nested parallelism in the async Parquet reader. This also uses TransferAlways, taking care of ARROW-12916. `enable_parallel_column_conversion` is kept as it still affects the threaded scanner. Closes #10482 from lidavidm/arrow-12597 Authored-by: David Li <li.davidm96@gmail.com> Signed-off-by: David Li <li.davidm96@gmail.com>