All fair points. Thanks for the insight :) -- Michael Mior mm...@uwaterloo.ca
Le ven. 9 nov. 2018 à 14:03, Julian Hyde <jh...@apache.org> a écrit : > I’m not very impressed with this work. A DSL for query transformation > rules has been tried in the past - all the way back to EXODUS[1] - but > there are so many complexities to deal with that it is better to write your > rules in a full programming language. > > They don’t explicitly talk about relational algebra, which means that they > are still thinking they can do their transformations on the SQL AST. Which > - as I discovered around 1999, writing my 3rd SQL parser and 2nd optimizer > - is not going to work because SQL’s scoping rules make everything too > brittle. > > Julian > > [1] http://pages.cs.wisc.edu/~dewitt/includes/queryopt/sigmod87.pdf > > > On Nov 9, 2018, at 7:16 AM, Michael Mior <mm...@apache.org> wrote: > > > > They're not using Calcite. Their code base is in Go and they wrote their > > own in Go. If you read the blog post, they describe a DSL they built for > > expressing optimizer rules which is kind of nice although not terribly > > different from what we're doing with Calcite. > > > > -- > > Michael Mior > > mm...@apache.org > > > > > > Le ven. 9 nov. 2018 à 08:00, Stamatis Zampetakis <zabe...@gmail.com> a > > écrit : > > > >> Thanks for sharing this Michael! > >> > >> I had a look on their blog post but I didn't notice something really > novel. > >> It gives me the impression that they re-implemented a Volcano-style > >> optimizer like the one of Calcite. > >> > >> Out of curiosity, are they using Calcite, or they really built > everything > >> from scratch? > >> > >> Best, > >> Stamatis > >> > >> Στις Παρ, 9 Νοε 2018 στις 2:55 π.μ., ο/η Michael Mior <mm...@apache.org > > > >> έγραψε: > >> > >>> The folks from Cockroch Labs just shared an interesting blog post on > the > >>> development of their optimizer. Could be some interesting lessons in > >> their > >>> code base. > >>> > >>> https://www.cockroachlabs.com/blog/building-cost-based-sql-optimizer/ > >>> > >>> > >>> -- > >>> Michael Mior > >>> mm...@apache.org > >>> > >> > >
