```
$ ~/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)

{
    for (size_t i = 0; i < names.size(); ++i)
    {
        if (startsWith(subcolumn_name, names[i]))
        {
            size_t name_length = names[i].size();
            const auto & subcolumn = extractElementColumn(column, i);
            if (subcolumn_name.size() == name_length)
                return subcolumn.assumeMutable();
            if (subcolumn_name[name_length] == '.')
                return elems[i]->getSubcolumn(subcolumn_name.substr(name_length + 1), subcolumn);
        }
    }
    throw Exception(ErrorCodes::ILLEGAL_COLUMN, "There is no subcolumn {} in type {}", subcolumn_name, getName());
}
static DataTypePtr create(const ASTPtr & arguments)