[makmanalp]

Even with an OLAP use case, you're most often not scanning every row in the database if you even have a single where clause / conditional filter which is almost always. You need to have some level of locality and if your format doesn't support that, that'll be enough to kill performance.

Also parquet has lots of features that'll get you to the general vicinity of a single record tolerably fast without sacrificing much in terms of storage or computational complexity. It's a small price for a big win.