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Benjamin KietzmanWes McKinney
5dbf30a68ac
Benjamin Kietzman authored and Wes McKinney committed 3ae46e33aa9
ARROW-9321: [C++][Dataset] Populate statistics opportunistically

Populate ParquetFileFragment statistics whenever a reader is opened anyway. Also provides an explicit method for forcing load of statistics. (I exposed this as a public method, but maybe we'd prefer to hide it inside the `statistics` property the way we do physical schema?)

Closes #7692 from bkietz/9321-populate-statistics-on-read

Lead-authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Signed-off-by: Wes McKinney <wesm@apache.org>