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[jira] [Created] (ARROW-3444) Table.nbytes attribute

Dave Hirschfeld created ARROW-3444:

             Summary: Table.nbytes attribute
                 Key: ARROW-3444
                 URL: https://issues.apache.org/jira/browse/ARROW-3444
             Project: Apache Arrow
          Issue Type: New Feature
            Reporter: Dave Hirschfeld

As it says in the title, I think this would be a very handy attribute to have. 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__|https://docs.python.org/3/library/sys.html#sys.getsizeof] protocol

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