```
$ ~/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)

class ReadBuffer;
/** Stream to read data in VALUES format (as in INSERT query).
  */
class ValuesBlockInputFormat final : public IInputFormat
{
public:
    /** Data is parsed using fast, streaming parser.
      * If interpret_expressions is true, it will, in addition, try to use SQL parser and interpreter
      *  in case when streaming parser could not parse field (this is very slow).
      * If deduce_templates_of_expressions is true, try to deduce template of expression in some row and use it
      * to parse and interpret expressions in other rows (in most cases it's faster
      * than interpreting expressions in each row separately, but it's still slower than streaming parsing)
      */
    ValuesBlockInputFormat(ReadBuffer & in_, const Block & header_, const RowInputFormatParams & params_,
                           const FormatSettings & format_settings_);
    String getName() const override { return "ValuesBlockInputFormat"; }
    void resetParser() override;
    
    void setContext(const Context & context_) { context = std::make_unique<Context>(context_); }
    const BlockMissingValues & getMissingValues() const override { return block_missing_values; }
private:
    enum class ParserType
    {
        Streaming,
        BatchTemplate,
        SingleExpressionEvaluation
    };
    typedef std::vector<std::optional<ConstantExpressionTemplate>> ConstantExpressionTemplates;