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**Describe the bug**

Interval data type is not passed correctly from subquery

**Does it reproduce on recent release?**

Yes, tested on 21.6.5.37.

**How to reproduce**

```sql
SELECT
    toIntervalDay(5) AS interval,
    now() + interval AS res

┌─interval─┬─────────────────res─┐
│        5 │ 2021-07-03 13:11:45 │
└──────────┴─────────────────────┘
```

But if I wrap interval calculation in subquery:

```sql
SELECT
    (SELECT toIntervalDay(5)) AS interval,
    now() + interval AS res

Received exception from server (version 21.6.5):
Code: 70. DB::Exception: Received from localhost:9000. DB::Exception: Conversion from Int8 to IntervalDay is not supported: While processing CAST(5, 'IntervalDay') AS interval, now() + interval AS res.
```

**Expected behavior**

Both queries should work the same way.
data_to.resize(size * (strlen("YYYY-MM-DD") + 1));
            else if constexpr (std::is_same_v<FromDataType, DataTypeDateTime>)
                data_to.resize(size * (strlen("YYYY-MM-DD hh:mm:ss") + 1));
            else if constexpr (std::is_same_v<FromDataType, DataTypeDateTime64>)
                data_to.resize(size * (strlen("YYYY-MM-DD hh:mm:ss.") + col_from->getScale() + 1));
            else
                data_to.resize(size * 3);   
            offsets_to.resize(size);
            WriteBufferFromVector<ColumnString::Chars> write_buffer(data_to);
            if (null_map)
            {
                for (size_t i = 0; i < size; ++i)
                {
                    bool is_ok = FormatImpl<FromDataType>::template execute<bool>(vec_from[i], write_buffer, &type, time_zone);
                    null_map->getData()[i] |= !is_ok;
                    writeChar(0, write_buffer);
                    offsets_to[i] = write_buffer.count();
                }
            }
            else
            {
                for (size_t i = 0; i < size; ++i)
                {
                    FormatImpl<FromDataType>::template execute<void>(vec_from[i], write_buffer, &type, time_zone);
                    writeChar(0, write_buffer);
                    offsets_to[i] = write_buffer.count();
                }
            }
            write_buffer.finalize();
            if (null_map)