```
qoega-dev.sas.yp-c.yandex.net :) SELECT toDate('2000-01-01') < toDateTime('2000-01-01 00:00:01', 'Europe/Moscow');

SELECT toDate('2000-01-01') < toDateTime('2000-01-01 00:00:01', 'Europe/Moscow')

Query id: baf63ad5-1893-401c-9728-63bd5c295df1

┌─less(toDate('2000-01-01'), toDateTime('2000-01-01 00:00:01', 'Europe/Moscow'))─┐
│                                                                              0 │
└────────────────────────────────────────────────────────────────────────────────┘

1 rows in set. Elapsed: 0.011 sec.

qoega-dev.sas.yp-c.yandex.net :) SELECT toDate('2000-01-01') < toDateTime('2000-01-01 00:00:01');

SELECT toDate('2000-01-01') < toDateTime('2000-01-01 00:00:01')

Query id: c2136446-a3a0-4567-a94e-68f40dc1f158

┌─less(toDate('2000-01-01'), toDateTime('2000-01-01 00:00:01'))─┐
│                                                             1 │
└───────────────────────────────────────────────────────────────┘

1 rows in set. Elapsed: 0.011 sec.
```
{
    
    if (types.empty())
        return std::make_shared<DataTypeNothing>();
    if (types.size() == 1)
        return types[0];
    
    {
        bool all_equal = true;
        for (size_t i = 1, size = types.size(); i < size; ++i)
        {
            if (!types[i]->equals(*types[0]))
            {
                all_equal = false;
                break;
            }
        }
        if (all_equal)
            return types[0];
    }