I really like how Flink is incorporating SQL as a first class citizen.<p>If you're interested in stuff like this, keep an eye on OctoSQL[1].<p>We're working hard on event time streaming with exactly-once semantics in pure SQL, being greatly inspired by the work and research done by the Flink contributors.<p>It's our Bachelor Thesis actually. Though we have much left to work on, with features like distributed execution, so there's still a long way ahead!<p>[1]: <a href="https://github.com/cube2222/octosql" rel="nofollow">https://github.com/cube2222/octosql</a>