```
$ ~/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 = iter->second;
        if (found_in_cache)
            *found_in_cache = true;
    }
    return res;
}
bool ConstantExpressionTemplate::parseExpression(ReadBuffer & istr, const FormatSettings & format_settings, const Settings & settings)
{
    size_t cur_column = 0;
    try
    {
        if (tryParseExpression(istr, format_settings, cur_column, settings))
        {
            ++rows_count;
            return true;
        }
    }
    catch (DB::Exception & e)
    {
        for (size_t i = 0; i < cur_column; ++i)
            columns[i]->popBack(1);
        if (!isParseError(e.code()))
            throw;
        return false;
    }
    for (size_t i = 0; i < cur_column; ++i)
        columns[i]->popBack(1);
    return false;
}
bool ConstantExpressionTemplate::tryParseExpression(ReadBuffer & istr, const FormatSettings & format_settings, size_t & cur_column, const Settings & settings)