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3558db995c
"Test case 'csv' produces incorrect result on OpenBSD"
mmapped pages were not being invalidated when writes occurred to the
file vi a fd i/o operation.
Force explicit invalidation and not rely on implicit invalidation.
sql/examples/ha_tina.cc:
Bug#15669
Make sure to invalidate in memory pages when the file has been
altered by fd i/o.
This is important to some operating systems, such as OpenBSD.