George Kollias c2343dc841
Make restricting reader fill_buffer more efficient ...
Currently, restricting_mutation_reader::fill_buffer justs reads
lower-layer reader's fragments one by one without doing any further
transformations. This change just swaps the parent-child buffers in a
single step, as suggested in #3604 , and, hence, removing any possible
per-fragment overhead.
I couldn't find any test that exercises restricting_mutation_reader as
a mutation source, so I added test_restricted_reader_as_mutation_source
in mutation_reader_test.
Tests: unit (release), though these 4 tests are failing regardless of
my changes (they fail on master for me as well): snitch_reset_test,
sstable_mutation_test, sstable_test, sstable_3_x_test.
Fixes : #3604
Signed-off-by: George Kollias <georgioskollias@gmail.com >
Message-Id: <1540052861-621-1-git-send-email-georgioskollias@gmail.com >
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c2343dc841