**Describe the bug**
Under certain conditions the equals comparison between String and Date yields the wrong result. Range Comparisons with greather-than-equals returns the correct result set.

**How to reproduce**
* Which ClickHouse server version to use: 21.2.5.5 (latest at the time of this issue)
* Which interface to use, if matters: HTTP (but should not matter)

```sql
CREATE TABLE default.myTable (
	myDay Date,
	myOrder Int32,
	someData String
) 
ENGINE = ReplacingMergeTree
PARTITION BY floor(toYYYYMMDD(myDay), -1)
ORDER BY (myOrder)
;

INSERT INTO default.myTable (myDay, myOrder) VALUES ('2021-01-01', 1);
INSERT INTO default.myTable (myDay, myOrder) VALUES ('2021-01-02', 2); // This row should be returned
INSERT INTO default.myTable (myDay, myOrder) VALUES ('2021-01-03', 3);

SELECT * FROM default.myTable mt
WHERE myDay = '2021-01-02';
```

**Expected behavior**
The last query in the example should yield the marked row. Instead it returns a empty result set.

There must be a connection to the used `PARTITION KEY`. The issue fails to reproduce as soon as I do any changes to the `PARTITION KEY` setting.

{
        hyperrectangle[prefix_size] = Range(key_left[prefix_size]);
        result = result | forAnyHyperrectangle(key_size, key_left, key_right, true, false, hyperrectangle, prefix_size + 1, initial_mask, callback);
        if (result.isComplete())
            return result;
    }
    
    if (right_bounded)
    {
        hyperrectangle[prefix_size] = Range(key_right[prefix_size]);
        result = result | forAnyHyperrectangle(key_size, key_left, key_right, false, true, hyperrectangle, prefix_size + 1, initial_mask, callback);
        if (result.isComplete())
            return result;
    }
    return result;
}
BoolMask KeyCondition::checkInRange(
    size_t used_key_size,
    const FieldRef * left_key,
    const FieldRef * right_key,
    const DataTypes & data_types,
    bool right_bounded,
    BoolMask initial_mask) const
{
    std::vector<Range> key_ranges(used_key_size, Range());
/*  std::cerr << "Checking for: [";
    for (size_t i = 0; i != used_key_size; ++i)
        std::cerr << (i != 0 ? ", " : "") << applyVisitor(FieldVisitorToString(), left_key[i]);
    std::cerr << " ... ";
    if (right_bounded)