tarantool / tarantool / 8278

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travis-ci

vinyl: apply UPSERTs in key read views sequence, when possible

Now the write_iterator creates a list of read views for each key.
If this list contains UPSERTs and at least one older REPLACE,
or the write_iterator works on the last level, then all newer
UPSERTs in the sequence can be turned into REPLACEs.
For example:

One key read view sequence:
   < ---- LSN  ---- <
REPLACE    UPSERT    UPSERT    UPSERT.

Can be turned into
   < ---- LSN ---- <
REPLACE   REPLACE   REPLACE   REPLACE.

Closes #2502

49 of 49 new or added lines in 1 file covered. (100.0%)

29202 of 33425 relevant lines covered (87.37%)

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