presto-kudu/src/main/java/io/prestosql/plugin/kudu/properties/KuduTableProperties.java/KuduTableProperties/getNumReplicas
class KuduTableProperties:    public static Optional<Integer> getNumReplicas(Map<String, Object> tableProperties)
    {
        requireNonNull(tableProperties);

        @SuppressWarnings("unchecked")
        Integer numReplicas = (Integer) tableProperties.get(NUM_REPLICAS);
        return Optional.ofNullable(numReplicas);
    }