```
$ ~/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)

}
        else if (rollback_on_exception)
            column.popBack(1);
    }
    parser_type_for_column[column_idx] = ParserType::SingleExpressionEvaluation;
    
    if (shouldDeduceNewTemplate(column_idx))
    {
        if (templates[column_idx])
            throw DB::Exception("Template for column " + std::to_string(column_idx) + " already exists and it was not evaluated yet",
                                ErrorCodes::LOGICAL_ERROR);
        std::exception_ptr exception;
        try
        {
            bool found_in_cache = false;
            const auto & result_type = header.getByPosition(column_idx).type;
            const char * delimiter = (column_idx + 1 == num_columns) ? ")" : ",";
            auto structure = templates_cache.getFromCacheOrConstruct(result_type, format_settings.null_as_default,
                                                                     TokenIterator(tokens), token_iterator,
                                                                     ast, *context, &found_in_cache, delimiter);
            templates[column_idx].emplace(structure);
            if (found_in_cache)
                ++attempts_to_deduce_template_cached[column_idx];
            else
                ++attempts_to_deduce_template[column_idx];
            buf.rollbackToCheckpoint();
            if (templates[column_idx]->parseExpression(buf, format_settings, settings))
            {
                ++rows_parsed_using_template[column_idx];
                parser_type_for_column[column_idx] = ParserType::BatchTemplate;