Piotr Wieczorek 66ac66178b alternator, cdc: Don't emit events for no-op removes ...

Deletes that don't change the state of the database visible to the user
(e.g. an attempt to delete a missing item) shouldn't produce a cdc log.
This commit addresses this DynamoDB compatibility issue if the delete is
a partition delete, a row delete, or a cell delete. It works under the
assumption that the change was produced by Alternator. This means that
it doesn't support range deletes, static row deletes, deletes of
collection cells other than a map, etc. See also its parent commit,
which introduces the methods that this commit extends.

This commit handles the following cases:
- `DeleteItem of nonexistent item: nothing`,
- `BatchWriteItem.DeleteItem of nonexistent item: nothing`.

Refs https://github.com/scylladb/scylladb/pull/26121

2025-10-30 08:38:30 +01:00

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