presto-main/src/main/java/io/prestosql/type/UuidOperators.java/UuidOperators/castFromUuidToVarbinary
class UuidOperators:    @ScalarOperator(CAST)
    @SqlType(StandardTypes.VARBINARY)
    public static Slice castFromUuidToVarbinary(@SqlType(StandardTypes.UUID) Slice slice)
    {
        return wrappedBuffer(slice.getBytes());
    }