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ARF1Uwe L. Korn
a179933dc96
ARF1 authored and Uwe L. Korn committed b74b027e6b4
ARROW-6403: [Python] Expose FileReader::ReadRowGroups() to Python

Expose ReadRowGroups to Python to allow efficient filtered reading implementations as suggested @xhochy in https://github.com/apache/arrow/issues/2491#issuecomment-416958663_

Without this PR users would have to re-implement threaded reads in python.

Closes #5241 from ARF1/ReadRowGroups and squashes the following commits:

d4ab18640 <ARF1> yet another flake8 violation
6b17a8d28 <ARF1> more flake8 violations
5759ea38a <ARF1> fix flake8 violations
fe84e1698 <ARF1> Add read_row_groups() to ParquetFile
321ed3dea <ARF1> add tests
423926cbd <ARF1> fix missing self reference
229c2da4c <ARF1>  Expose FileReader::ReadRowGroups() to Python

Lead-authored-by: ARF1 <arik@funke.eu>
Co-authored-by: ARF1 <ARF1@github>
Signed-off-by: Uwe L. Korn <uwelk@xhochy.com>