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Weston PaceDavid Li
fb892c639d5
Weston Pace authored and David Li committed 9c85e5465a5
ARROW-12287: [C++] Create enumerating generator

Adds an enumerating generator which tags items with their index as well as whether or not they were the last item in the sequence.  This is needed for reassembly potentially out of order record batches during scan.

Closes #9945 from westonpace/feature/arrow-12287

Lead-authored-by: Weston Pace <weston.pace@gmail.com>
Co-authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>