Steve Wirts, an expert kdb+ developer at OpenFin, recently presented his latest innovation to OpenFin’s Hypergrid/Q project at a Google Developer Group Meetup. It’s a version that allows you to do rollups with an arbitrary tree hierarchy. You can read a little more about it if you scroll down here.
Since then, Steve has a continued to work on Hypergrid/Q:
The latest example is a million row grid with 20 columns, rollups using sum/max/min/first/avg, and sub second updates. It has 2 q servers, 1 for computation and 1 for caching the results so Hypergrid is never blocked.
Also, it now has a dnd interface for selecting the hierarchy/hidden/visible columns.