dictGet('name', ...) should check for XML dictionary 'name' if XML dict=name does not exists then use SQL dictionary from the currectDatabase()

{
public:
    static constexpr auto name = "dictIsIn";
    static FunctionPtr create(const Context & context)
    {
        return std::make_shared<FunctionDictIsIn>(context);
    }
    explicit FunctionDictIsIn(const Context & context_)
        : helper(context_) {}
    String getName() const override { return name; }
private:
    size_t getNumberOfArguments() const override { return 3; }
    bool useDefaultImplementationForConstants() const final { return true; }