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Wes McKinney
ff744ef13c6
Wes McKinney authored 56f1e91d296
ARROW-771: [Python] Add read_row_group / num_row_groups to ParquetFile

requires PARQUET-946 https://github.com/apache/parquet-cpp/pull/291

cc @cpcloud @jreback @mrocklin

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #494 from wesm/ARROW-771 and squashes the following commits:

126789a [Wes McKinney] Fix docstring
1009423 [Wes McKinney] Add read_row_group / num_row_groups to ParquetFile