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ARROW-8729: [C++][Dataset] Ensure non-empty batches when only virtual…
… columns are projected This bug is inherited from `parquet::arrow::RowGroupRecordBatchReader`, which yielded empty record batches when no columns were projected because no field readers were available from which to derive batch size. I've added logic to get usable batch sizes from file metadata in the empty columns case Closes #7534 from bkietz/8729-empty-virtual-columns Authored-by: Benjamin Kietzman <bengilgit@gmail.com> Signed-off-by: Wes McKinney <wesm@apache.org>
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