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Measure performance of the single-mutation reader: make_flat_mutation_reader_from_mutation_v2. Comparable to the `one_row` case that consumes the single mutation using the multi-mutatio reader: make_flat_mutation_reader_from_mutations_v2 perf_mutation_readers shows ~20-30% improvement of make_flat_mutation_reader_from_mutation_v2 the same single mutation, just given as a single-item vector to make_flat_mutation_reader_from_mutations_v2. test iterations median mad min max Before: combined.one_row 720118 825.668ns 1.020ns 824.648ns 827.750ns After: combined.one_mutation 881482 751.157ns 0.397ns 750.211ns 751.912ns combined.one_row 843270 756.553ns 0.303ns 755.889ns 757.911ns Signed-off-by: Benny Halevy <bhalevy@scylladb.com>