Re: [Exist-open] How does range indexing know which collation sequence to use?

[Pierrick B. <pie...@fr...>]

Hi,

Oystein Reigem a =E9crit :

> I believe=20
> collation sequence becomes relevant when querying string elements with=20
> operators >, <, etc.

Yes. Basically, a general comparison operator is fall back to a value=20
comparison one which is then in turn called as=20
op:numeric-equal(fn:compare(A, B), 0), so the default collation of the=20
XQuery should be used. Most of the time, if not always, the Unicode=20
codepoint collation will be I guess.

However, I don't know how a range index would behave if another=20
collation were used.

 > How does range indexing know which collation sequence to use?

I'm afraid this info is not stored anywhere. Obviously, it would make=20
sense to keep this kind of info in the index itself to "hint" the=20
comparator.

PS : feel free to submit test cases that demonstrate any problem in this=20
area... or in another one.

Cheers,

p.b.