Support Built-in Aggregation Wheels 

As of now only ``COUNT(*)`` is integrated. Make other aggregation functions such as ``SUM(col), AVG(col), MIN(col), MAX(col)`` work as well.

```sql
SELECT SUM(fare_amount) FROM yellow_tripdata
WHERE tpep_dropoff_datetime >= '2022-01-01T00:00:00Z'
AND tpep_dropoff_datetime < '2022-02-01T00:00:00Z'",
```