```
$ ~/arc/build/clickhouse/programs/clickhouse client
ClickHouse client version 21.2.1.1-arcadia.
Connecting to localhost:9000 as user default.
Connected to ClickHouse server version 21.2.1 revision 54447.

max42-dev.sas.yp-c.yandex.net :) create table t(a Tuple(UInt8, UInt8)) engine = Log()

CREATE TABLE t
(
    `a` Tuple(UInt8, UInt8)
)
ENGINE = Log

Query id: b49dbb5d-d2a9-4c99-b90e-00c60edf2103

Ok.

0 rows in set. Elapsed: 0.005 sec. 

max42-dev.sas.yp-c.yandex.net :) insert into t values ((NULL, 42))

INSERT INTO t VALUES

Query id: 318d6f3e-f3bc-467c-85ff-62da908230dd

Logical error: 'Unexpected literal type inside Array: Nothing. It's a bug'.
Aborted (core dumped)
```

This is CH similar to one from Arcadia r7788360 (~fresh master version from GH).

(you don't have to strictly follow this form)

{
    return assert_cast<ColumnTuple &>(column).getColumn(idx);
}
static inline const IColumn & extractElementColumn(const IColumn & column, size_t idx)
{
    return assert_cast<const ColumnTuple &>(column).getColumn(idx);
}
void DataTypeTuple::serializeBinary(const Field & field, WriteBuffer & ostr) const
{
    const auto & tuple = get<const Tuple &>(field);
    for (const auto idx_elem : ext::enumerate(elems))
        idx_elem.second->serializeBinary(tuple[idx_elem.first], ostr);
}
void DataTypeTuple::deserializeBinary(Field & field, ReadBuffer & istr) const
{
    const size_t size = elems.size();
    Tuple tuple(size);
    for (const auto i : ext::range(0, size))
        elems[i]->deserializeBinary(tuple[i], istr);
    field = tuple;
}
void DataTypeTuple::serializeBinary(const IColumn & column, size_t row_num, WriteBuffer & ostr) const