[Monetdb-developers] [Monetdb-pf-checkins] pathfinder/tests/W3C_use_cases/XQUF/R/Tests Q7x.milS, 1.2, 1.3 Q7x.stable.out, 1.2, 1.3

Stefan Manegold Stefan.Manegold at cwi.nl
Tue Oct 31 09:34:07 CET 2006


Hi Jan

thanks for watching and teaching (at least me;-))!

Good point --- in the W3C cases, my "sloppy" (incorrect) rewriting results
in the same results, probably due to the characteristics of the given
documents and/or predicates.

In fact, I only added these rewitten version to point out the typing problem
in pathfinder (proper bug report will follow).

I'll consider applying your fixes once I have time ...

Stefan

On Tue, Oct 31, 2006 at 09:21:24AM +0100, Jan Rittinger wrote:
> Stefan,
> 
> your rewrite may return different results (at least without schema 
> knowledge).
> 
> If you have E1/E2[P] the predicate P is evaluated on E2 only. Your 
> rewrite changes the binding to E1/E2 and is thus equivalent to (E1/E2)[P].
> 
> The correct rewrite thus would be
> 
> doc("items.xml")/items/item_tuple[itemno=1002]
> ->
> doc(\"items.xml\")/items/(for $i in item_tuple where $i/itemno=1002 
> return $i)
> 
> which would result in the same translation as without the for loop.
> 
> On 10/30/2006 10:09 PM, Stefan Manegold wrote with possible deletions:
> > Update of /cvsroot/monetdb/pathfinder/tests/W3C_use_cases/XQUF/R/Tests
> > In directory sc8-pr-cvs7.sourceforge.net:/tmp/cvs-serv14959/XQUF/R/Tests
> > 
> > Modified Files:
> > 	Q7x.milS Q7x.stable.out 
> > Log Message:
> > 
> > with a path expression E and a predicate P,
> > Pathfinder's derives the type of
> >         E[P]
> > as "node", while this could be "element" as required by some functions;
> > replacing
> >         E[P]
> > by
> >         for $i in E where P return $i
> > yields an "element".
> > 
> > Added althernative versions for all tests where  E[P]  triggers a type error
> > but  for $i in E where P return $i  works fine.
> > 
> > 
> > Index: Q7x.stable.out
> > ===================================================================
> > RCS file: /cvsroot/monetdb/pathfinder/tests/W3C_use_cases/XQUF/R/Tests/Q7x.stable.out,v
> > retrieving revision 1.2
> > retrieving revision 1.3
> > diff -u -d -r1.2 -r1.3
> > --- Q7x.stable.out	30 Oct 2006 20:54:19 -0000	1.2
> > +++ Q7x.stable.out	30 Oct 2006 21:09:18 -0000	1.3
> > @@ -15,7 +15,7 @@
> >  xquery("xml","
> >  do insert
> >    <comment>This is a bargain !</comment>
> > -as last into exactly-one(doc(\"items.xml\")/items/item_tuple[itemno=1002])
> > +as last into exactly-one(for $i in doc(\"items.xml\")/items/item_tuple where $i/itemno=1002 return $i)
> >  ").printf();
> >  
> >  xquery("xml","doc(\"items.xml\")").printf();
> > 
> > Index: Q7x.milS
> > ===================================================================
> > RCS file: /cvsroot/monetdb/pathfinder/tests/W3C_use_cases/XQUF/R/Tests/Q7x.milS,v
> > retrieving revision 1.2
> > retrieving revision 1.3
> > diff -u -d -r1.2 -r1.3
> > --- Q7x.milS	30 Oct 2006 20:54:19 -0000	1.2
> > +++ Q7x.milS	30 Oct 2006 21:09:17 -0000	1.3
> > @@ -4,7 +4,7 @@
> >  xquery("xml","
> >  do insert
> >    <comment>This is a bargain !</comment>
> > -as last into exactly-one(doc(\"items.xml\")/items/item_tuple[itemno=1002])
> > +as last into exactly-one(for $i in doc(\"items.xml\")/items/item_tuple where $i/itemno=1002 return $i)
> >  ").printf();
> >  
> >  xquery("xml","doc(\"items.xml\")").printf();
> > 
> > 
> > -------------------------------------------------------------------------
> > Using Tomcat but need to do more? Need to support web services, security?
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> > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
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> > _______________________________________________
> > Monetdb-pf-checkins mailing list
> > Monetdb-pf-checkins at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/monetdb-pf-checkins
> > 
> 
> -- 
> Jan Rittinger
> Database Systems
> Technische Universität München (Germany)
> http://www-db.in.tum.de/~rittinge/
> 
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> Monetdb-developers mailing list
> Monetdb-developers at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/monetdb-developers
> 

-- 
| Dr. Stefan Manegold | mailto:Stefan.Manegold at cwi.nl |
| CWI,  P.O.Box 94079 | http://www.cwi.nl/~manegold/  |
| 1090 GB Amsterdam   | Tel.: +31 (20) 592-4212       |
| The Netherlands     | Fax : +31 (20) 592-4312       |




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