[riku_iki]

you can run sql DB over compressed filesystem, and some DBs allow you to compress tables too

> like being able to deserialize a single column without having to read in entire rows.

and it reads filesystem's whole page anyway

[aeroevan]

Sorry for the late reply, but parquet is a columnar format so if it's big enough data, you should have multiple pages/blocks of data in a single column for a specific row group, and then be able to seek to the next row group and sequentially read the next set of blocks.