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  1. Apache Arrow
  2. ARROW-11797

[C++][Dataset] Provide Scanner methods to yield/visit scanned batches

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      From discussion in https://issues.apache.org/jira/browse/ARROW-11782

      It'd be useful to consumers of Scanner to receive an iterator of scanned record batches or apply a visitor to batches as they are scanned without handling ScanTasks. For example, this could enable aggregations or other computations which don't require the entire table to be materialized.

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              bkietz Ben Kietzman
              bkietz Ben Kietzman
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