```
$ ~/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)

res[i] = convertFieldToType(src_arr[i], element_type);
                if (res[i].isNull() && !element_type.isNullable())
                {
                    
                    have_unconvertible_element = true;
                }
            }
            return have_unconvertible_element ? Field(Null()) : Field(res);
        }
    }
    else if (const DataTypeTuple * type_tuple = typeid_cast<const DataTypeTuple *>(&type))
    {
        if (src.getType() == Field::Types::Tuple)
        {
            const auto & src_tuple = src.get<Tuple>();
            size_t src_tuple_size = src_tuple.size();
            size_t dst_tuple_size = type_tuple->getElements().size();
            if (dst_tuple_size != src_tuple_size)
                throw Exception("Bad size of tuple in IN or VALUES section. Expected size: "
                    + toString(dst_tuple_size) + ", actual size: " + toString(src_tuple_size), ErrorCodes::TYPE_MISMATCH);
            Tuple res(dst_tuple_size);
            bool have_unconvertible_element = false;
            for (size_t i = 0; i < dst_tuple_size; ++i)
            {
                const auto & element_type = *(type_tuple->getElements()[i]);
                res[i] = convertFieldToType(src_tuple[i], element_type);
                if (!res[i].isNull() || element_type.isNullable())
                    continue;
                /*
                 * Either the source element was Null, or the conversion did not