How does it work? If I have a collection/table with 100,000 rows and want to create a histogram by month does it pull the 100,000 rows over the wire to your se

How does it work? If I have a collection/table with 100,000 rows and want to create a histogram by month does it pull the 100,000 rows over the wire to your servers and does the aggregation there? select month, sum(x) from T group by month;