Citus is Open Sourced since "Mar 2016", so it is not so old. https://github.com/citusdata/citus/blob/release-5.1/CHANGELOG.md https://github.com/citusdata/citu

Citus is Open Sourced since "Mar 2016", so it is not so old. https://github.com/citusdata/citus/blob/release-5.1/CHANGELOG.md https://github.com/citusdata/citus/blob/release-5.1/CHANGELO... "citus v5.0.0 (March 24, 2016) - Public release under AGPLv3 - PostgreSQL extension compatible with PostgreSQL 9.5 and 9.4"