Piotr Wieczorek 2812e67f47 cdc: Emit a preimage for non-clustered tables ...

Until this patch, CDC haven't fetched a preimage for mutations
containing only a partition tombstone. Therefore, single-row deletions
in a table witout a clustering key didn't include a preimage, which was
inconsistent with single-row clustered deletions. This commit addresses
this inconsistency.

Second reason is compatibility with DynamoDB Streams, which doesn't
support entire-partition deletes. Alternator uses partition tombstones
for single-row deletions, though, and in these cases the 'OldImage' was
missing from REMOVE records.

Fixes https://github.com/scylladb/scylladb/issues/26382

Closes scylladb/scylladb#26578

2025-10-29 17:54:58 +02:00

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