```
$ ~/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)

{
    const Block & header = getPort().getHeader();
    const IDataType & type = *header.getByPosition(column_idx).type;
    auto settings = context->getSettingsRef();
    
    skipToNextRow(0, 1);
    buf.makeContinuousMemoryFromCheckpointToPos();
    buf.rollbackToCheckpoint();
    Expected expected;
    Tokens tokens(buf.position(), buf.buffer().end());
    IParser::Pos token_iterator(tokens, settings.max_parser_depth);
    ASTPtr ast;
    bool parsed = parser.parse(token_iterator, ast, expected);
    
    if (column_idx + 1 != num_columns)
        parsed &= token_iterator->type == TokenType::Comma;
    else
        parsed &= token_iterator->type == TokenType::ClosingRoundBracket;