**Describe what's wrong**

```sql
SELECT toTypeName(s), toString(s) FROM
(
 SELECT toFixedString('',32) AS s 
 UNION ALL
 SELECT null AS s 
)
```

this query works in all versions from 19.17 to 21.8, but stop works after 21.9+ 

https://fiddle.clickhouse.com/7bd65b36-a6e6-470a-8bdc-4c98a33ff453
21.8 works

https://fiddle.clickhouse.com/9e40a424-4027-4c7f-bd41-b20935ae9129
21.9 doesn't work
```
Received exception from server (version 21.9.6):
Code: 44. DB::Exception: Received from localhost:9000. DB::Exception: Illegal column Nullable(FixedString(32)) of first argument of function toString. (ILLEGAL_COLUMN)
```

this query works in all versions

```sql
SELECT toTypeName(s), toString(s) FROM
(
 SELECT '' AS s 
 UNION ALL
 SELECT null AS s 
)
```
https://fiddle.clickhouse.com/4f810f03-1644-4eb7-b696-0341b1bbdbc4


**Does it reproduce on recent release?**
Yes, reproduce in all releases 21.9+
{
        
        
        if (from < 0)
            return 0;
        auto day_num = time_zone.toDayNum(ExtendedDayNum(from));
        return day_num < DATE_LUT_MAX_DAY_NUM ? day_num : DATE_LUT_MAX_DAY_NUM;
        return (from < DATE_LUT_MAX_DAY_NUM)
            ? from
            : std::min<Int32>(Int32(time_zone.toDayNum(from)), Int32(0xFFFFFFFF));
    }
};
template <typename FromType, typename ToType>
struct ToDateTransform8Or16Signed
{
    static constexpr auto name = "toDate";
    static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl &)
    {
        if (from < 0)
            return 0;
        return from;
    }
};
template <typename Name> struct ConvertImpl<DataTypeDateTime64, DataTypeDate32, Name, ConvertDefaultBehaviorTag>
        : DateTimeTransformImpl<DataTypeDateTime64, DataTypeDate32, TransformDateTime64<ToDate32Impl>> {};
template <typename FromType, typename ToType>
struct ToDate32Transform32Or64
{
    static constexpr auto name = "toDate32";
    static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl & time_zone)