Hi, still fighting with synonyms, I have another question.
I'm not understanding the role, and the effect, of the
"autoGeneratePhraseQueries" attribute in a synonym context.
I mean, if I have the following field type:
<fieldtype name="custom_text" class="solr.TextField"
autoGeneratePhraseQueries="true">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.SynonymGraphFilterFactory" synonyms="synonyms.txt"
ignoreCase="false" expand="true"/>
</analyzer>
</fieldtype>
with the following synonym: *out of warranty,oow*
with the following query: *q=out of warranty*
The output query is exactly what I would expect: *(title:oow
PhraseQuery(title:"out of warranty"))*
Setting the autoGeneratePhraseQueries to *false* (or better, forgetting
the attribute declaration at all), the output query is:
*(title:oow (+title:out +title:of +title:warranty))*
Which matches things like "I had to step out for renewing the warranty
of my device".
This, at first glance sounds to me completely wrong. Or, better, I'm not
able to imagine a use case where that synonym decomposition could be
useful. Is that wanted? I would say that the query parser should always
generates a phrase query for multi-term synonyms, like in the first
example (i.e. autoGeneratePhraseQueries=true).
Thanks in advance,
Andrea
