Paweł Dziepak 52a4e79210 mutation_reader: add multi_range_reader ...

So far, the only way to combine outputs of multiple readers was to use
combining reader. It is very general and, in particular, supports case
when the readers emit mutations from overlapping ranges.

However, we have cases (e.g. streaming) when we need to read from
several disjoint ranges. Combining reader is a suboptimal solution as it
requires to creating a reader for each range and ignores the fact that
they do not overlap.

This patch introduces multi_range_mutation_reader which takes a
mutation_source and a sorted set of disjoint ranges. Internally, it uses
mutation_reader::fast_forward_to() to move to the next range once the
current one is completed.

2016-12-15 13:07:31 +00:00

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