[elephant-devel] Major elephant upgrade

[Robert L. Read]

On Tue, 2008-03-11 at 14:41 -0400, lists at infoway.net wrote:
> Hi Ian,
> 
> Thanks. I just downloaded the latest darcs and will look at it. I've  
> been evaluating different querying to propose a syntax.
> 
> BTW, in the darcs I downloaded 10 minutes ago, I ran the tests and got:
> 
>   Did 421 checks.
>      Pass: 420 (99%)
>      Skip: 0 ( 0%)
>      Fail: 1 ( 0%)
> 
>   Failure Details:
>   --------------------------------
>   THREADED-IDX-ACCESS []:
>        Unexpected Error: #<SB-THREAD:JOIN-THREAD-ERROR {12B38DB1}>
> Joining thread failed: thread #<THREAD {12B1FEA9}> has not returned  
> normally...

I had these errors as well.  I assumed they were releated to my
architecture.  Are you using SBCL?

We may have to disable these tests, but I would really rather have them
working under SBCL, if Leslie or some SBCL user can accomplish that.

> 
> During the tests, I got a lot of errors on the threads about Null  
> controller.
> 
> Thanks,
> Daniel
> 
> On Mar 11, 2008, at 12:05 PM, Ian Eslick wrote:
> 
> > Daniel,
> >
> > I just promoted a simple sketch of a query interpreter and syntax on  
> > the unstable branch that handles queries like:
> >
> > (query-select #'(lambda (person school) (format t "Person named: ~A  
> > at ~A~%" (name person) (name school)))
> > 	'(select ((?p person) (?s school))
> > 		  (where (and (> (age ?p) 10) (< (age ?p) 25))
> > 		         (= ?s (school ?p))
> > 		         (string> (name ?s) "Foo")))))
> >
> > This calls the provided function for all pairs of people and schools  
> > for ages between 10 and 25 where the school name is alphabetically  
> > greater than "Foo"
> >
> > If you load and evaluate src/elephant/query-example.lisp you can  
> > play with this little hack.
> >
> > There are absolutely no performance considerations.  It essentially  
> > does the search through lisp objects that Robert alluded to.  It  
> > maps all instances of person and uses constraints like (= ?s  
> > (school ?p)) to create the connection between objects via slot  
> > values.  You have to make sure that it can figure out what ?s is  
> > before you can use ?s in another expression, so it's pretty  
> > restrictive.
> >
> > Anyway, hopefully this will give you some ideas on how to get started!
> >
> > Ian
> >
> >
> > On Mar 6, 2008, at 8:23 AM, lists at infoway.net wrote:
> >
> >>
> >> On Mar 4, 2008, at 10:38 PM, Ian Eslick wrote:
> >>
> >>> = A little query interpreter (Waldo?, Daniel?)
> >>> Read sets of oids from indices, implement an efficient in-memory  
> >>> sort&merge over oids, and deserialize after the query.  I've  
> >>> specified a bunch of this so could provide a set of pointers to  
> >>> start.  Looking at some other object query languages and proposing  
> >>> a syntax would be a good place to start
> >>
> >> Will definitely like to pick up on this again. Been doing some more  
> >> reading and think should have some time to invest on this.
> >>
> >> - Daniel
> >> _______________________________________________
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> >
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> 
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