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I've been looking for books that cover database implementation techniques such as this — the "memo" algorithm was new to me, but I'm also generally interested in query planning and optimization. Anyone got any recommendations? I started a thread: https://news.ycombinator.com/item?id=18410692.

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This is not a book, but we did write up some documentation for developers that gives a nice overview of how the optimizer works:

https://github.com/cockroachdb/cockroach/blob/master/pkg/sql...

Might be worth a read if you're interested in implementation techniques.

Posted in that thread: https://news.ycombinator.com/item?id=18411110

TLDR: check out CMU DB group at https://db.cs.cmu.edu/

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