"The changes in this series fall into one of the following:
1) improve unit tests
2) improve code reuse in mvcc so that later cahnges will be easier
3) fix minor issues which were exposed by the above"
* tag 'tgrabiec/improve-and-fix-mvcc-tests-v4' of github.com:scylladb/seastar-dev:
tests: mvcc: Add more tests for consistency of continuity merging
tests: mvcc: Fix test_apply_is_atomic()
tests: mvcc: Do not assume that continuity of current row is updated on partition_snapshot_row_cursor::maybe_refresh()
mvcc: Reuse partition_snapshot_row_cursor in apply_to_incomplete()
mvcc: Propagate region reference to partition_entry::apply_to_incomplete()
mvcc: Introduce partition_snapshot_row_cursor::ensure_entry_if_complete()
mvcc: partition_snapshot_row_cursor: Extract prepare_heap()
mvcc: Add const-qualified partition_version_ref::operator*()
tests: mvcc: Use mutation_partition_assertions
tests: Introduce mutation_partition_assertions
tests: Randomize static row continuity in random_mutation_generator
tests: mutation_assertion: Introduce is_continuous()
mvcc: Introduce partition_snapshot_row_cursor::read_partition()
mutation_partition: Introduce deletable_row::apply() from a clustering_row fragment
mutation_partition: Extract sliced() from mutation into mutation_partition
mvcc: Introduce partition_snapshot::static_row_continuous()
mvcc: Introduce partition_snapshot::range_tombstones() for full range
mvcc: Don't require external schema in parition_snapshot::range_tombstones()
mutation_partition: Define equal_continuity() using get_continuity()
mutation_partition: Make check_continuity() const-qualified
mutation_partition: Make check_continuity() public
mutation_partition: Introduce mutation_partition::get_continuity()
Introduce clustering_interval_set
mutation_partition: Leave moved-from row in an empty state
mutation_partition: Fix upgrade() not preserving static row continuity
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