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From "KuroSaka TeruHiko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-3962) For the match-all-docs query *:*, (e)dismax parser passes "*:*" to tokenizer. Under certain conditions, hit suboptimal (<1.0) score is reported.
Date Wed, 17 Oct 2012 19:22:04 GMT
KuroSaka TeruHiko created SOLR-3962:
---------------------------------------

             Summary: For the match-all-docs query *:*, (e)dismax parser passes "*:*" to tokenizer.
Under certain conditions, hit suboptimal (<1.0) score is reported.
                 Key: SOLR-3962
                 URL: https://issues.apache.org/jira/browse/SOLR-3962
             Project: Solr
          Issue Type: Bug
          Components: query parsers
    Affects Versions: 4.0, 3.6, 3.5
            Reporter: KuroSaka TeruHiko


My understanding is that the special match-all-docs query "\*:\*" shouldn't call tokenizers
and all hits should have score 1.0.  In fact, this is usually the case.

But, when all of these conditions are met, suboptimal (<1.0) hit scores are reported:
* dismax or edismax parser is used
* a tokenizer that splits "\*:\*" into multiple tokens is used
* pf parameter is specified for a field that uses the above tokenizer


Use case:
* We created a Japanese tokenizer which happens to break "\*:\*" into three tokens representing
each symbols. 
* Our client uses this tokenizer for Japanese with edismax on Solr 3.6.
* They have pf=text^0.5 in the default section in solrconfig.xml.
* When search is done with the query string "\*:\*", all the hits from Japanese has the score
much less than 1.0.

Below is how to simulate this situation with a NGramTokenizer.  (It is not realistic.)

1. Run Solr with the default setting.  Post all *.xml docs in examples/exampledocs.
2. Stop the Solr.
3. Add this fieldType:
{noformat}
    <fieldtype name="text_fake" class="solr.TextField" positionIncrementGap="100">
       <analyzer type="index">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
      </analyzer>
      <analyzer type="query">
        <tokenizer class="solr.NGramTokenizerFactory"
           maxGramSize="1"
           minGramSize="1" />
      </analyzer>
    </fieldtype>
{noformat}
4. Change the field definition of "name" to use "text_fake".
5. Restart Solr
6. GET this URL:
http://localhost:8983/solr/select?indent=on&version=2.2&q=*%3A*&fq=&start=0&rows=10&fl=*%2Cscore&qt=&wt=&debugQuery=on&defType=edismax&pf=name

Below is an excerpt of query debug output.  Notice that "\*:\*" is expanded with spaces to
"\* : \*":
{noformat}
...
<doc>
<str name="id">ati</str>
<str name="compName_s">ATI Technologies</str>
<str name="address_s">
33 Commerce Valley Drive East Thornhill, ON L3T 7N6 Canada
</str>
<long name="_version_">1415830106362871808</long>
<float name="score">0.07443535</float>
</doc>
</result>
<lst name="debug">
<str name="rawquerystring">*:*</str>
<str name="querystring">*:*</str>
<str name="parsedquery">
(+MatchAllDocsQuery(*:*) DisjunctionMaxQuery((name:"* : *")))/no_coord
</str>
{noformat}

And here is a partial stack trace at the time the tokenizer is called from the query parser:
{noformat}
NGramTokenizer.incrementToken() line: 112	
CachingTokenFilter.fillCache() line: 90	
CachingTokenFilter.incrementToken() line: 55	
ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParserBase).newFieldQuery(Analyzer, String,
String, boolean) line: 513	
ExtendedDismaxQParser$ExtendedSolrQueryParser.newFieldQuery(Analyzer, String, String, boolean)
line: 1018	
ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParserBase).getFieldQuery(String, String,
boolean) line: 474	
ExtendedDismaxQParser$ExtendedSolrQueryParser(SolrQueryParser).getFieldQuery(String, String,
boolean) line: 169	
ExtendedDismaxQParser$ExtendedSolrQueryParser.getQuery() line: 1163	
ExtendedDismaxQParser$ExtendedSolrQueryParser.getAliasedQuery() line: 1105	
ExtendedDismaxQParser$ExtendedSolrQueryParser.getQueries(Alias) line: 1145	
ExtendedDismaxQParser$ExtendedSolrQueryParser.getAliasedQuery() line: 1073	
ExtendedDismaxQParser$ExtendedSolrQueryParser.getFieldQuery(String, String, int) line: 989

ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParserBase).handleQuotedTerm(String, Token,
Token) line: 1082	
ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParser).Term(String) line: 462	
ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParser).Clause(String) line: 257	
ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParser).Query(String) line: 181	
ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParser).TopLevelQuery(String) line: 170

ExtendedDismaxQParser$ExtendedSolrQueryParser(QueryParserBase).parse(String) line: 120	
ExtendedDismaxQParser.addShingledPhraseQueries(BooleanQuery, List<Clause>, Map<String,Float>,
int, float, int) line: 506	
ExtendedDismaxQParser.parse() line: 338	
ExtendedDismaxQParser(QParser).getQuery() line: 143	
QueryComponent.prepare(ResponseBuilder) line: 118	
SearchHandler.handleRequestBody(SolrQueryRequest, SolrQueryResponse) line: 192	
SearchHandler(RequestHandlerBase).handleRequest(SolrQueryRequest, SolrQueryResponse) line:
129	
...
{noformat}



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