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xuyimingWes McKinney
494e7a9c571
xuyiming authored and Wes McKinney committed eec12f30a90
ARROW-8963: [C++][Parquet] optimize LeafReader::NextBatch to save memory

LeafReader::NextBatch should Reset memory first, otherwise Reserve will allocate memory twice,
fix design: switch the reserve and set to void reserve to 2 * size

Closes #7288 from hn5092/optimize_parquet_cpp_reader

Authored-by: xuyiming <100650920@qq.com>
Signed-off-by: Wes McKinney <wesm+git@apache.org>