**Use case**

Comparison between DateTime64 and DateTime / Date types is allowed but the behavior is confusing (it looks like used numerical comparison):

* from one side for zero-precision it works as expected (values compared as datetime-based ones): 

```sql
SELECT toTypeName(dt64) AS dt64_typename, dt64 = dt
FROM 
(
    SELECT 
        toDateTime64(toStartOfInterval(now(), toIntervalSecond(1), 'UTC'), 0, 'UTC') AS dt64,
        toStartOfInterval(now(), toIntervalSecond(1), 'UTC') AS dt
)

/*
┌─dt64_typename────────┬─equals(dt64, dt)─┐
│ DateTime64(0, 'UTC') │                1 │
└──────────────────────┴──────────────────┘
*/
```
* from another side for non-zero-precision its behavior is unexpected if not used explicit type conversion:

```sql
SELECT 
    toTypeName(dt64) AS dt64_typename,
    dt64 = dt,
    toDateTime(dt64) = dt,
    dt64 = toDateTime64(dt, 1, 'UTC')
FROM 
(
    SELECT 
        toDateTime64(toStartOfInterval(now(), toIntervalSecond(1), 'UTC'), 1, 'UTC') AS dt64,
        toStartOfInterval(now(), toIntervalSecond(1), 'UTC') AS dt
)
/*
┌─dt64_typename────────┬─equals(dt64, dt)─┬─equals(toDateTime(dt64), dt)─┬─equals(dt64, toDateTime64(dt, 1, 'UTC'))─┐
│ DateTime64(1, 'UTC') │                0 │                            1 │                                        1 │
└──────────────────────┴──────────────────┴──────────────────────────────┴──────────────────────────────────────────┘
*/
```

**Describe the solution you'd like**
I think this comparison either:
- should be not allowed and throw an exception to ask for user uses explicit conversion
- or make valid implicit conversion relying on datetime/date essence of values

else if (left_is_string && right_is_string && (res = executeString(col_left_untyped, col_right_untyped)))
        {
            return res;
        }
        else if ((res = executeWithConstString(
                result_type, col_left_untyped, col_right_untyped,
                left_type, right_type,
                input_rows_count)))
        {
            return res;
        }
        else if (isColumnedAsDecimal(left_type) || isColumnedAsDecimal(right_type))
        {
            
            if (!allowDecimalComparison(left_type, right_type) && !date_and_datetime)
                throw Exception("No operation " + getName() + " between " + left_type->getName() + " and " + right_type->getName(),
                    ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
            return executeDecimal(col_with_type_and_name_left, col_with_type_and_name_right);
        }
        else if (left_type->equals(*right_type))
        {
            return executeGenericIdenticalTypes(col_left_untyped, col_right_untyped);
        }
        else
        {
            return executeGeneric(col_with_type_and_name_left, col_with_type_and_name_right);
        }
    }
#if USE_EMBEDDED_COMPILER
    bool isCompilableImpl(const DataTypes & types) const override