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 │
└────┴───────┘
```
[[maybe_unused]] const ColumnUInt8 * cond_col,
        [[maybe_unused]] Block & block,
        [[maybe_unused]] const ColumnNumbers & arguments,
        [[maybe_unused]] size_t result,
        [[maybe_unused]] const ColumnArray * col_left_array,
        [[maybe_unused]] size_t input_rows_count) const
    {
        if constexpr (std::is_same_v<NumberTraits::Error, typename NumberTraits::ResultOfIf<T0, T1>::Type>)
            return false;
        else
        {
            using ResultType = typename NumberTraits::ResultOfIf<T0, T1>::Type;
            const IColumn * col_right_untyped = block.getByPosition(arguments[2]).column.get();
            if (const auto * col_right_array = checkAndGetColumn<ColumnArray>(col_right_untyped))
            {
                const ColVecT1 * col_right_vec = checkAndGetColumn<ColVecT1>(&col_right_array->getData());