Updating a Nullable column value by using alter .... where ... causes to set another value!

ClickHouse version: 20.6.3.28
Engine: MergeTree
OS: Ubuntu 18.04.3 LTS

Steps to reproduce:
```sql
CREATE TABLE table1(
	id int,
	price Nullable(Int32)
)
ENGINE = MergeTree()
PARTITION BY id
ORDER BY (id);
INSERT INTO table1 (id, price) VALUES (1, 100);
ALTER TABLE table1  update price = 150 where id=1;
SELECT * FROM table1;
```
We expect the price to be `150`, but it's `93148480`:

```
┌─id─┬────price─┐
│  1 │ 93148480 │
└────┴──────────┘
```
Using `Decimal(9,2)` field instead of `Int32` would set the value  `932342.88` always. It seems there's a fixed value for each data type.

If we don't use such a `where` clause, it works correctly:
```sql
ALTER TABLE db1.table1  update price = 150 where 1=1;
┌─id─┬─price─┐
│  1 │   150 │
└────┴───────┘
```
{
        return data[n];
    }
    T & getElement(size_t n)
    {
        return data[n];
    }
protected:
    Container data;
};
template <typename T>
template <typename Type>
ColumnPtr ColumnVector<T>::indexImpl(const PaddedPODArray<Type> & indexes, size_t limit) const
{
    size_t size = indexes.size();
    if (limit == 0)
        limit = size;
    else
        limit = std::min(size, limit);
    auto res = this->create(limit);
    typename Self::Container & res_data = res->getData();
    for (size_t i = 0; i < limit; ++i)
        res_data[i] = data[indexes[i]];
    return res;
}
}