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e3fde8087a
CDC log table records a mutation as a sequence of log rows that record an atomic change (i.e. a row marker, tombstones, etc.), whereas a mutation in Alternator Streams always appears as a single log row. The type of operation is determined based on the type of the last log row in CDC. As a result, updates that create a row always appeared to Alternator Streams as an update (row marker + data), rather than an insert. This commit makes them a single log row. Its operation type is insert if it contains a row marker, and an update otherwise, which gives results consistent with DynamoDB Streams.