Blatant self-promotion, but people interested in PostgreSQL query processing might also be interested in these slide decks: "Query Execution Techniques in Post

Blatant self-promotion, but people interested in PostgreSQL query processing might also be interested in these slide decks: "Query Execution Techniques in PostgreSQL" http://neilconway.org/talks/executor.pdf http://neilconway.org/talks/executor.pdf "Inside the PostgreSQL Query Optimizer" http://neilconway.org/talks/optimizer/optimizer.pdf http://neilconway.org/talks/optimizer/optimizer.pdf