I have enabled the SynonymGraphFilter in my field configuration in order to
support multi-word synonyms (I am using Solr 7.6). Here is my field
configuration:
<fieldType name="text_syn" class="solr.TextField">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.SynonymGraphFilterFactory" ignoreCase="true"
synonyms="synonyms.txt"/>
</analyzer>
</fieldType>
<field name="title" type="text_syn" indexed="true">
And this is my synonyms.txt file:
frozen dinner,microwave food
Scenario 1: blue shirt (query with no synonyms)
Here is my first Solr query:
http://localhost:8983/solr/base/search?q=blue+shirt&qf=title&defType=edismax&debugQuery=on
And this is the parsed query I see in the debug output:
+((title:blue) (title:shirt))
Scenario 2: frozen dinner (query with synonyms)
Now, here is my second Solr query:
http://localhost:8983/solr/base/search?q=frozen+dinner&qf=title&defType=edismax&debugQuery=on
And this is the parsed query I see in the debug output:
+(((+title:microwave +title:food) (+title:frozen +title:dinner)))
I am wondering why the first query looks for documents containing at least one
of the two query tokens, whereas the second query looks for documents with both
of the query tokens? I would understand if it looked for both the tokens of the
synonyms (i.e. both microwave and food) to avoid the sausagization problem. But
I would like to get partial matches on the original query at least (i.e. it
should also match documents containing just the token 'dinner').
Would any one know why the behavior is different across queries with and
without synonyms? And how could I work around this if I wanted partial matches
on queries that also have synonyms?
Ideally, I would like the parsed query in the second case to be:
+(((+title:microwave +title:food) (title:frozen title:dinner)))
I'd appreciate any help with this. Thanks!
