Thanks for all the great answers last week about Cassandra. I have an additional question about cassandra and columns/supercolumns. I had naively assumed that columns and super-columns map to an internal row-key (like how in Bigtable the indexed map is row/column-key/timestamp to data), but some performance information I've found hints otherwise. (things got slow with large numbers of columns)
How are columns and super-columns handled? Specifically, are operations on specific columns within a row closer to O(num-columns) or closer to log-n (i.e. individual row-performance)?
