[Koha-bugs] [Bug 17871] New: Can't retrieve facets (or zebra::snippet) from Zebra with YAZ 5.8.1

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=17871

            Bug ID: 17871
           Summary: Can't retrieve facets (or zebra::snippet) from Zebra
                    with YAZ 5.8.1
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P5 - low
         Component: Z39.50 / SRU / OpenSearch Servers
          Assignee: gmcharlt at gmail.com
          Reporter: dcook at prosentient.com.au
        QA Contact: testopia at bugs.koha-community.org
                CC: m.de.rooy at rijksmuseum.nl

Colin Campbell and Frédéric Demians mentioned in 2015 that Zebra facets don't
work with YAZ 5.8.1:
https://lists.katipo.co.nz/public/koha/2015-February/041987.html

In 2016, Zeno said he couldn't get zebra::snippet to work:
http://koha.1045719.n5.nabble.com/Zebra-the-elements-zebra-snippet-doesn-t-work-td5871444.html

I've looked at Indexdata's YAZ git repo for 5.8.1:
https://github.com/indexdata/yaz/blame/v5.8.1/src/retrieval.c

And I think the problem is this commit:
https://github.com/indexdata/yaz/commit/f24766f1e9fc5404fc0b512af8607d7f7054f4be

At first, I thought the problem was with yaz_match_glob, but I've tested this
function independently, and I think it's OK. I think the problem might be with
how "el_best" is getting set. 

In theory, <retrieval syntax="xml"/> should be selected as el_best first...
then zebra::* should be selected as it should have a true value returned from
yaz_match_glob. (Note that "return 0" appears to indicate success for
yaz_retrieval_request.)

So if you try to use facets with YAZ 5.8.1, you get the following from Zebra: 
[25] Specified element set name not valid for specified database -- v2 addinfo
''. 

That makes it seem like el_best isn't being set at all... but I don't know. I'm
going to email Indexdata and see what they come up with for this one.

But in any case... I have a solution for now.

If we remove the line <retrieval syntax="xml" name="zebra::*" /> and restart
Zebra, we can get results using zebra::facet and zebra::snippet. 

I've tested this change with OpenSuse Leap 42.2 with Zebra 2.0.60 and YAZ
5.8.1, and it works, but I'd be interested in hearing about other people's
experiences with older (and newer) versions of YAZ. 

With commit 67abcc64, Marcel actually removed most unnecessary retrieval
elements, but Tomas added them back with ca074c92 along with the zebra::* line.

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