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4be0bdbc07
Until now, every PutItem operation appeared in the Alternator Streams as two events - a REMOVE and a MODIFY. DynamoDB Streams emits only INSERT or MODIFY, depending on whether a row was replaced, or created anew. A related issue scylladb#6918 concerns distinguishing the mutation type properly. This was because each call to PutItem emitted the two CDC rows, returned by GetRecords. Since this patch, we use a collection tombstone for the `:attrs` column, and a separate tombstone for each regular column in the table's schema. We don't expect that new tables would have any other regular column, except for the `:attrs` and keys, but we may encounter them in in upgraded tables which had old GSIs or LSIs. Fixes: scylladb#6930. Closes scylladb/scylladb#24991