On: Eva – A distributed entity-attribute-value databas...

[eternalban]

I suspect by "ideas from Datomic" you are referring to ideas predating Datomic (and Clojure) that are used and possibly refined in Datomic.

[emmanueloga_ → eternalban]

To be fair, a quick google search for "open source datalog database" does not return much that is usable out-of-the-box, other than datomic: mostly academic projects or adapters for other databases with some different querying API, like SPARQL.

Datomic seems to be one of the best ones in terms of execution of the ideas behind it and usage in real world projects, to say the least.

[abc_lisper → eternalban]

I think he meant to say they were not mainstream

[bitwize → eternalban]

In the Clojure community, no new technology officially exists until Rich Hickey invents it.

[fnordsensei → bitwize]

My impression is that the Clojure community (including Rich Hickey) is generally transparent and proud about digging up and reusing ideas from the 80s in a modern context.