> "data needs to be read from disk in its original row-oriented format before processing, which will account for the lion’s share of the query’s execution laten

> "data needs to be read from disk in its original row-oriented format before processing, which will account for the lion’s share of the query’s execution latency." IO is still a bottleneck without column-stores. The selectivity, compression and encoding alone can generate massive speedups because there's less data to process, and less to move through the execution pipeline. But batch/vectorized processing on row-stores is gaining adoption. MemSQL and SQL Server also use similar techniques.