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Benjamin KietzmanFrançois Saint-Jacques
65ce68b7a90
Benjamin Kietzman authored and François Saint-Jacques committed 975f4eb8e6d
ARROW-9146: [C++][Dataset] Lazily store fragment physical schema

The physical schema is required to validate predicates used for filtering row groups based on statistics.

It can also be explicitly provided to ensure that if no row groups satisfy the predicate no I/O is done.

Closes #7526 from bkietz/9146-Scanning-a-Fragment-with-

Lead-authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Signed-off-by: François Saint-Jacques <fsaintjacques@gmail.com>