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  1. Apache Arrow
  2. ARROW-9346

[C++][Python][Dataset] Add total_byte_size metadata to RowGroupInfo

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      See https://github.com/apache/arrow/pull/7546#issuecomment-651177576.

      The row group information in Parquet's FileMetadata includes a "total_byte_size" field. It would be useful to expose this information on the RowGroupInfo object, similarly as we already expose "num_rows".

      cc Rick Zamora

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            jorisvandenbossche Joris Van den Bossche Assign to me
            jorisvandenbossche Joris Van den Bossche
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