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Comment by philzook

Nice!

I'll note there is a really shallow version of naive datalog I rather like if you're willing to compromise on syntax and nonlinear variable use.

   edge = {(1,2), (2,3)}
   path = set()
   for i in range(10):
       # path(x,y) :- edge(x,y).
       path |= edge
       # path(x,z) :- edge(x,y), path(y,z).
       path |= {(x,z) for x,y in edge for (y1,z) in path if y == y1}

Similarly it's pretty easy to hand write SQL in a style that looks similar and gain a lot of functionality and performance from stock database engines. https://www.philipzucker.com/tiny-sqlite-datalog/

I wrote a small datalog from the Z3 AST to sqlite recently along these lines https://github.com/philzook58/knuckledragger/blob/main/kdrag...

parent philzook 1 year ago

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