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 constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
            {
                col_null_map_to = ColumnUInt8::create(size, false);
                vec_null_map_to = &col_null_map_to->getData();
            }
            for (size_t i = 0; i < size; ++i)
            {
                if constexpr ((is_big_int_v<FromFieldType> || is_big_int_v<ToFieldType>) &&
                    (std::is_same_v<FromFieldType, UInt128> || std::is_same_v<ToFieldType, UInt128>))
                {
                    if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
                    {
                        vec_to[i] = 0;
                        (*vec_null_map_to)[i] = true;
                    }
                    else
                        throw Exception("Unexpected UInt128 to big int conversion", ErrorCodes::NOT_IMPLEMENTED);
                }
                else if constexpr (std::is_same_v<FromDataType, DataTypeUUID> != std::is_same_v<ToDataType, DataTypeUUID>)
                {
                    throw Exception("Conversion between numeric types and UUID is not supported", ErrorCodes::NOT_IMPLEMENTED);
                }
                else
                {
                    if constexpr (IsDataTypeDecimal<FromDataType> || IsDataTypeDecimal<ToDataType>)
                    {
                        if constexpr (std::is_same_v<Additions, AccurateOrNullConvertStrategyAdditions>)
                        {
                            ToFieldType result;
                            bool convert_result = false;