in cassandra/src/it/scala/org/apache/pekko/projection/cassandra/CassandraProjectionSpec.scala [99:107]
def concatToText(id: String, payload: String): Future[Done] = {
for {
concatStr <- findById(id).map {
case Some(concatStr) => concatStr.concat(payload)
case _ => ConcatStr(id, payload)
}
_ <- session.executeWrite(s"INSERT INTO $keyspace.$table (id, concatenated) VALUES (?, ?)", id, concatStr.text)
} yield Done
}