Discussion: allow skip the null value in partial update CDC format from ScyllaDB/Cassandra

[lmatz]

https://debezium.io/documentation/reference/stable/connectors/cassandra.html

Other databases' CDC format includes all the columns and their new values after the update.

But ScyllaDB/Cassandra can choose to present as partial updates, e.g. associate a null value with columns that are not changed.

The partial update requires RW to read the old row so that it can compose a full new row to be encoded and written into the storage.

Otherwise, ScyllaDB/Cassandra will incur extra reads on their side when CDC.

[github-actions]

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