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Benjamin KietzmanFrançois Saint-Jacques
81d61a6440a
Benjamin Kietzman authored and François Saint-Jacques committed 2ca1706625e
ARROW-8061: [C++][Dataset] Provide RowGroup fragments for ParquetFileFormat

Provides ParquetFileFragment, which may view a subset of row groups within a parquet file. The indices of viewed row groups are available through the `row_groups()` property which is exposed to python. Construction of subset-viewing ParquetFileFragments is not yet exposed to python.

Closes #6670 from bkietz/8061-Ability-to-specify-granul

Authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Signed-off-by: François Saint-Jacques <fsaintjacques@gmail.com>