```
$ ~/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)

{
    assertChar('(', buf);
    for (size_t column_idx = 0; column_idx < num_columns; ++column_idx)
    {
        skipWhitespaceIfAny(buf);
        PeekableReadBufferCheckpoint checkpoint{buf};
        bool read;
        
        
        
        
        if (parser_type_for_column[column_idx] == ParserType::Streaming)
            read = tryReadValue(*columns[column_idx], column_idx);
        else if (parser_type_for_column[column_idx] == ParserType::BatchTemplate)
            read = tryParseExpressionUsingTemplate(columns[column_idx], column_idx);
        else 
            read = parseExpression(*columns[column_idx], column_idx);
        if (!read)
            block_missing_values.setBit(column_idx, row_num);
        
    }
    skipWhitespaceIfAny(buf);
    if (!buf.eof() && *buf.position() == ',')
        ++buf.position();
    ++total_rows;
}
bool ValuesBlockInputFormat::tryParseExpressionUsingTemplate(MutableColumnPtr & column, size_t column_idx)