**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.

return callback(hyperrectangle);
    if (prefix_size + 1 == key_size)
    {
        if (left_bounded && right_bounded)
            hyperrectangle[prefix_size] = Range(key_left[prefix_size], true, key_right[prefix_size], true);
        else if (left_bounded)
            hyperrectangle[prefix_size] = Range::createLeftBounded(key_left[prefix_size], true);
        else if (right_bounded)
            hyperrectangle[prefix_size] = Range::createRightBounded(key_right[prefix_size], true);
        return callback(hyperrectangle);
    }
    
    if (left_bounded && right_bounded)
        hyperrectangle[prefix_size] = Range(key_left[prefix_size], false, key_right[prefix_size], false);
    else if (left_bounded)
        hyperrectangle[prefix_size] = Range::createLeftBounded(key_left[prefix_size], false);
    else if (right_bounded)
        hyperrectangle[prefix_size] = Range::createRightBounded(key_right[prefix_size], false);
    for (size_t i = prefix_size + 1; i < key_size; ++i)
        hyperrectangle[i] = Range();
    BoolMask result = initial_mask;
    result = result | callback(hyperrectangle);
    
    
    
    
    if (result.isComplete())
        return result;
    
    if (left_bounded)