Paweł Dziepak 8e0da776ab db: convert single_key_sstalbe_reader to flat streams ...

Before flat mutation readers sstable::read_row() returned a
future<streamed_mutation>. That required a helper reader that would wait
for the streamed_mutations from all relevant sstables to be created and
then construct a mutation merger.
With flat mutation readers sstable::read_row_flat() returns a
flat_mutation_reader (no futures) so that the code can be simplified by
collecting all the relevant readers and creating a combined reader
without suspension points.
The unfortunate disadvantage of the flat_mutation_reader-based approach
is the fact that combined reader now needlessly compares the partition
keys even though we know that we read only a single partition, but
optimising that is out of scope of this patch.

2017-12-13 12:01:03 +00:00

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