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Antoine PitrouWes McKinney
c03f2f6fdd7
Antoine Pitrou authored and Wes McKinney committed cc747403dc3
ARROW-8011: [C++] Fix buffer size when reading Parquet data to Arrow

In some cases (the so-called "zero copy" reads), Arrow arrays read from Parquet would be backed by too big buffers, leading to possible private data leaks.

Closes #6562 from pitrou/ARROW-8011-parquet-buffer-size and squashes the following commits:

949702deb <Antoine Pitrou> ARROW-8011:  Fix buffer size when reading Parquet data to Arrow

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Wes McKinney <wesm+git@apache.org>