Kamil Braun 857911d353 mutation_reader: generalize combined_mutation_reader ...

It is now called `merging_reader`, and is used to change a `FragmentProducer`
that produces a non-decreasing stream of mutation fragments batches into
a `flat_mutation_reader` producing a non-decreasing stream of fragments.

The resulting stream of fragments is increasing except for places where
we encounter range tombstones (multiple range tombstones may be produced
with the same position_in_partition)

`merging_reader` is a simple adapter over `mutation_fragment_merger`.

The old `combined_mutation_reader` is simply a specialization of `merging_reader`
where the used `FragmentProducer` is `mutation_reader_merger`, an abstraction that
merges the output of multiple readers into one non-decreasing stream of fragment
batches.

There is no separate class for `combined_mutation_reader` now. Instead,
`make_combined_reader` works directly with `merging_reader`.

2020-11-19 14:35:11 +01:00

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