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    from 5653711  ARROW-5717: [Python] Unify variable dictionaries when 
converting to pandas
     add ff3ed85  ARROW-6353: [Python] [C++] Expose compression_level option to 
parquet.write_table

No new revisions were added by this update.

Summary of changes:
 cpp/src/arrow/util/compression.cc      | 38 ++++++++++++++++++-----
 cpp/src/arrow/util/compression.h       |  4 +++
 cpp/src/arrow/util/compression_test.cc | 57 ++++++++++++++--------------------
 cpp/src/arrow/util/compression_zlib.cc |  8 +++++
 cpp/src/arrow/util/compression_zlib.h  |  2 ++
 cpp/src/parquet/types.cc               |  4 +--
 python/pyarrow/_parquet.pxd            |  3 ++
 python/pyarrow/_parquet.pyx            | 11 ++++++-
 python/pyarrow/parquet.py              | 20 ++++++++++--
 python/pyarrow/tests/test_parquet.py   | 36 +++++++++++++++++++++
 10 files changed, 135 insertions(+), 48 deletions(-)

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