```
$ ~/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)

{
        for (size_t i = 0; i < ast->children.size(); ++i)
            if (std::find(dont_visit_children.begin(), dont_visit_children.end(), i) == dont_visit_children.end())
                visit(ast->children[i], force_nullable[i]);
    }
    void visit(ASTFunction & function, bool force_nullable)
    {
        if (function.name == "lambda")
            return;
        FunctionOverloadResolverPtr builder = FunctionFactory::instance().get(function.name, context);
        
        ColumnNumbers dont_visit_children = builder->getArgumentsThatAreAlwaysConstant();
        
        ColumnNumbers can_always_be_nullable = builder->getArgumentsThatDontImplyNullableReturnType(function.arguments->children.size());
        std::vector<char> force_nullable_arguments(function.arguments->children.size(), force_nullable);
        for (auto & idx : can_always_be_nullable)
            if (idx < force_nullable_arguments.size())
                force_nullable_arguments[idx] = true;
        visitChildren(function.arguments, dont_visit_children, force_nullable_arguments);
    }
    bool visitIfLiteral(ASTPtr & ast, bool force_nullable)