@David, indeed, I am a little bit reluctant to use non standardized tools. Anyhow, I am quite surprised by your sentence : there exists map containers working in linear access ? Do you have any references to point out ?
2014/1/1 David Lee <[email protected]> > On 31 Dec 2013 17:03, "jean-marc Mercier" <[email protected]> > wrote: > > @David pairs are also basically needed to write a linear algebra modulus, > the topic of this thread. And XQUERY don't provide any efficient pair. You > can't use Marklogic map, or any other vendor map to store vectors for > performance issues (a map is really slow). > > http://x-query.com/mailman/listinfo/talk > > *[DAL:] * > > *Just an FYI but MarkLogic also have native arrays (in addition to maps) > which are extremely efficient (they are stored internally as C arrays).* > > *But if you have to do a lot of iterating through the arrays - even > though the accessors are very efficient ,* > > *the surrounding FLOWR code is still XQuery which slows things down a > bit. Maybe or maybe not enough to make them not useful for you.* > > *Also the marklogic maps are not the same as XQuery 3 implemented maps, > they are a hash map under the hood and typically linear access.* > > > > *But back to your original issue, these are vendor extensions and hence > not portable to other implementations (Until XQuery itself * > > *standardizes on arrays and maps - then it is likely that vendor extension > implementations will be used to expose the standard interface).* > > *If what you want is pure XQuery ... it doesnt matter how fast these are > if you cant use them because they dont exist in all implementations.* > > > > > > *-David* > > > > > > >
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