21.2:

```
milovidov-desktop :) SELECT CAST(1111111111.222 AS DateTime64(3))

SELECT cast(1111111111.222, 'DateTime64(3)')

Query id: d10c8623-5c74-4a38-b535-a99f6af4d28d

┌─cast(1111111111.222, 'DateTime64(3)')─┐
│               2005-03-18 04:58:31.222 │
└───────────────────────────────────────┘
```

master:

```
milovidov-desktop :) SELECT CAST(1111111111.222 AS DateTime64(3))

SELECT cast(1111111111.222, 'DateTime64(3)')

Query id: cb4af967-a4ae-4df5-89ba-234d68675f93

┌─cast(1111111111.222, 'DateTime64(3)')─┐
│               2005-03-18 04:58:31.000 │
└───────────────────────────────────────┘
```
}
        }
        if (!result_column)
            throw Exception("Illegal type " + arguments[0].type->getName() + " of argument of function " + getName()
                + ". Only String or FixedString argument is accepted for try-conversion function."
                + " For other arguments, use function without 'orZero' or 'orNull'.",
                ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
        return result_column;
    }
};
struct PositiveMonotonicity
{
    static bool has() { return true; }
    static IFunction::Monotonicity get(const IDataType &, const Field &, const Field &)
    {
        return { true };
    }
};
struct UnknownMonotonicity
{
    static bool has() { return false; }
    static IFunction::Monotonicity get(const IDataType &, const Field &, const Field &)
    {
        return { false };
    }
};
template <typename T>
struct ToNumberMonotonicity
{
    static bool has() { return true; }