```
../contrib/libcxx/include/vector:1449: _LIBCPP_ASSERT '__n < size()' failed. vector[] index out of bounds Received signal 6 Received signal Aborted (6)
```

https://s3.amazonaws.com/clickhouse-test-reports/39973/24ee3e022df7e970b5925fea657bec3ad7303702/fuzzer_astfuzzerdebug//report.html

{
public:
    std::string getFunctionName() const
    {
        if (ast)
            return assert_cast<const ASTFunction *>(ast)->name;
        else
            return dag->function_base->getName();
    }
    size_t numArguments() const
    {
        if (ast)
        {
            const auto * func = assert_cast<const ASTFunction *>(ast);
            return func->arguments ? func->arguments->children.size() : 0;
        }
        else
            return dag->children.size();
    }
    Tree getArgumentAt(size_t idx) const