Avi Kivity fdc1449392 treewide: rename flat_mutation_reader_v2 to mutation_reader ...

flat_mutation_reader_v2 was introduced in a pair of commits in 2021:

  e3309322c3 "Clone flat_mutation_reader related classes into v2 variants"
  08b5773c12 "Adapt flat_mutation_reader_v2 to the new version of the API"

as a replacement for flat_mutation_reader, using range_tombstone_change
instead of range_tombstone to represent represent range tombstones. See
those commits for more information.

The transition was incremental; the last use of the original
flat_mutation_reader was removed in 2022 in commit

  026f8cc1e7 "db: Use mutation_partition_v2 in mvcc"

In turn, flat_mutation_reader was introduced in 2017 in commit

  748205ca75 "Introduce flat_mutation_reader"

To transition from a mutation_reader that nested rows within
a partition in a separate stream, to a flat reader that streamed
partitions and rows in the same stream.

Here, we reclaim the original name and rename the awkward
flat_mutation_reader_v2 to mutation_reader.

Note that mutation_fragment_v2 remains since we still use the original
for compatibilty, sometimes.

Some notes about the transition:

 - files were also renamed. In one case (flat_mutation_reader_test.cc), the
   rename target already existed, so we rename to
    mutation_reader_another_test.cc.

 - a namespace 'mutation_reader' with two definitions existed (in
   mutation_reader_fwd.hh). Its contents was folded into the mutation_reader
   class. As a result, a few #includes had to be adjusted.

Closes scylladb/scylladb#19356

2024-06-21 07:12:06 +03:00

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