Botond Dénes f5b012c952 flat_multi_range_mutation_reader: optimize for non-plural range vectors ...

Don't create a flat_multi_range_mutation_reader when the range vector
has 0 or 1 element. In the former case create an empty reader and in the
latter just create a reader with the mutation-source with the only range
in the vector.

2018-05-10 06:22:39 +03:00

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