Citus Blog

Custom types—called user-defined types in the PostgreSQL docs—are a powerful Postgres capability that, just like Postgres extensions, were envisioned from Day One in the original design of Postgres. Published in 1985, the Design of Postgres paper stated the 2nd design goal as: “provide user extendibility for data types, operators and access methods.”

It’s kind of cool that the creators of Postgres laid the foundation for the powerful Postgres extensions of today (like PostGIS for geospatial use cases, Citus for scaling out Postgres horizontally, pg_partman for time-based partitioning, and so many more Postgres extensions) way back in 1985 when the design of Postgres paper was first published.

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