nickva opened a new pull request, #5615:
URL: https://github.com/apache/couchdb/pull/5615
Previously, the scanner traversed docs by id, skipping deleted documents.
However, some plugins like the conflict checker, or the finder, may want to
inspect deleted docs. To fix this, switch to using by-seq order during
scanning. This will also let us add more precise checkpoints in the future; we
could, for example, checkpoint during the db traversal not just per-db.
To let plugins customize the traversal, modify the db_opened/2 callback so
it can return start changes sequence and changes folding options. Use this new
feature in the finder since there it makes sense to scan backwards to find the
most recently added data first (i.e. someone just added something they
shouldn't have to the db and we'd like to find it).
Since we now consider deleted documents, adjust the QuickJS scanner to
discard deleted FDIs before even opening the doc bodies.
For the conflict checker, add a test to ensure we do catch deleted conflicts
when all of them are deleted.
As minor tweak, improved the scanner tests by using `#doc{}` records instead
of plain tuples.
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