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  1. Apache Arrow
  2. ARROW-3444

[Python] Table.nbytes attribute

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      As it says in the title, I think this would be a very handy attribute to have available in Python. You can get it by converting to pandas and using `DataFrame.nbytes` but this is wasteful of both time and memory so it would be good to have this information on the `pyarrow.Table` object itself.

      This could be implemented using the _sizeof_ protocol

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              jorisvandenbossche Joris Van den Bossche
              dhirschfeld Dave Hirschfeld
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