I would be very interested in hearing more about that project, as it sounds very similar to what I am working on for my cancer research. The two problems I kee

I would be very interested in hearing more about that project, as it sounds very similar to what I am working on for my cancer research. The two problems I keep running into are that run length encoding means you have to read the entirety of the bitmap to get to the value you want, and looking up a particular value for a particular row (where you have to scan all the bitmaps for that column) - which as you state makes high cardinality columns slow. I would be very interested in learning about ways to overcome these issues. Hit me up at terence [at] siganakis [dot] com if you would like to talk more, or on twitter at @siganakis (since I can't find any contact information in your profile). Cheers