Locality of reference: data of one row stored near.
Getting data from one column is faster in CODBs, but getting data from one rows is usually slower.
OSS: ClickHouse, Apache HBase, some Postgres extension, some MariaDB extension.
PaaS: Amazon, Microsoft, Google and Oracle has some shit.
Proprietary: Vertica, many others
https://en.wikipedia.org/wiki/Column-oriented_DBMS https://en.wikipedia.org/wiki/List_of_column-oriented_DBMSes