From a glance, you have to define the queries before. Are you using anything currently?

What is your insert/update/delete rate? If low, maybe look at postgresql in-memory column-store https://github.com/knizhnik/imcs/

Another way may be voltdb. Since it's partitioned+single-thread/partition, and cross-partition queries are slow, you'll probably have to make a query for each partition and group results on the app.

Also curious.