bkietz opened a new pull request #7534:
URL: https://github.com/apache/arrow/pull/7534


   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


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