Hello Community,
I have a question regarding a strange behavior difference between term queries
and value queries.
During some test for a new service, my team and I were trying to query
documents based on a value query and the german language (xml:lang=”de”).
However the query result was empty, but we do know there are documents that
should match.
So I test around a bit and found out that if you send a raw combined query (via
the Java API) to the REST service of MarkLogic ,
the server just ignores any language set via the query options.
To make things clear for you, I created a simple test case that shows this
behavior. In a fresh new database with default settings I created 4 test
documents via the following XQuery:
xdmp:document-insert("/demo1.xml", <root><element
xml:lang="de">Zeitstand-Innendruckfestigkeit</element></root>);
xdmp:document-insert("/demo2.xml", <root><element xml:lang="en">long-term
hydrostatic strength</element></root>);
xdmp:document-insert("/demo3.xml",
<root><element>Zeitstand-Innendruckfestigkeit</element></root>);
xdmp:document-insert("/demo4.xml", <root><element>long-term hydrostatic
strength</element></root>);
As you can see, the documents are tagged differently by language or have no
tagging at all (which should result in English by default).
Now I am searching for the document with the following command:
search:resolve(<query xmlns="http://marklogic.com/appservices/search";
xmlns:search="http://marklogic.com/appservices/search";>
<and-query>
<value-query type="string">
<element ns="" name="element"/>
<text>long-term hydrostatic strength</text>
<weight>1.0</weight>
</value-query>
</and-query>
</query>,
<search:options xmlns:search="http://marklogic.com/appservices/search";>
<search:page-length>300</search:page-length>
<search:term>
<search:term-option>lang=de</search:term-option>
</search:term>
</search:options>)
So if you execute the search with the English word “long-term hydrostatic
strength” and “<search:term-option>lang=en</search:term-option>” within the
query options part,
all is fine and it results in 2 found documents (for both value-query and
term-query).
<search:response snippet-format="snippet" total="2" start="1" page-length="300"
xmlns:search="http://marklogic.com/appservices/search";>
<search:result index="1" uri="/demo2.xml"
path="fn:doc("/demo2.xml")" score="14336" confidence="0.5296452"
fitness="0.7490314">
<search:snippet>
<search:match
path="fn:doc("/demo2.xml")/root/element"><search:highlight>long-term
hydrostatic strength</search:highlight></search:match>
</search:snippet>
</search:result>
<search:result index="2" uri="/demo4.xml"
path="fn:doc("/demo4.xml")" score="14336" confidence="0.5296452"
fitness="0.7490314">
<search:snippet>
<search:match
path="fn:doc("/demo4.xml")/root/element"><search:highlight>long-term
hydrostatic strength</search:highlight></search:match>
</search:snippet>
</search:result>
<search:metrics>
<search:query-resolution-time>PT0.001277S</search:query-resolution-time>
<search:snippet-resolution-time>PT0.001016S</search:snippet-resolution-time>
<search:total-time>PT0.003034S</search:total-time>
</search:metrics>
</search:response>
The same applies if you try to run this with German language and the German
equivalent term “Zeitstand-Innendruckfestigkeit”. And the third scenario does
also work: searching for
the German term with no language constraint will result in one found document
(with both term-query and value-query).
However if you do above query for the English term with the language constraint
“<search:term-option>lang=de</search:term-option>” within the query options,
it results in no documents found for the term-query but in 2 found documents
for the value-query!
In other words it seems that the value-query just ignores the language
constraint set by the query options.
My question for this long story is: Is this a desired behavior or is this
something I should report to MarkLogic support as a bug?
Mit freundlichen Grüßen
i.A. Hubertus Willuhn
Informatiker
Datenservice | XML-Technologie
T +49 30 2601-2032| F +49 30 2601-42032
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