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Antoine PitrouWes McKinney
de6304fd8f4
Antoine Pitrou authored and Wes McKinney committed e3c7dbfa934
ARROW-8434: [C++] Avoid multiple schema deserializations in RecordBatchFileReader

This doesn't seem to make a difference in the included benchmark.

Closes #7606 from pitrou/ARROW-8434-avoid-multiple-schema-deserializations

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