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From Tom Burton-West <>
Subject edismax parser ignores mm parameter when tokenizer splits tokens (hypenated words, WDF splitting etc)
Date Thu, 28 Jun 2012 16:18:43 GMT

My previous e-mail with a CJK example has received no replies.   I verified
that this problem also occurs for English.  For example in the case of the
word "fire-fly" , The ICUTokenizer and the WordDelimeterFilter both split
this into two tokens "fire" and "fly".

With an edismax query and a must match of 2 :  q={!edsmax mm=2} if the
words are entered separately at [fire fly], the edismax parser honors the
mm parameter and does the equivalent of a Boolean AND query.  However if
the words are entered as a hypenated word [fire-fly], the tokenizer splits
these into two tokens "fire" and "fly" and the edismax parser does the
equivalent of a Boolean OR query.

I'm not sure I understand the output of the debugQuery, but judging by the
number of hits returned it appears that edismax is not honoring the mm
parameter. Am I missing something, or is this a bug?

 I'd like to file a JIRA issue, but want to find out if I am missing
something here.

Details of several queries are appended below.

Tom Burton-West

edismax query mm=2   query with hypenated word [fire-fly]

<lst name="debug">
<str name="rawquerystring">{!edismax mm=2}fire-fly</str>
<str name="querystring">{!edismax mm=2}fire-fly</str>
<str name="parsedquery">+DisjunctionMaxQuery(((ocr:fire ocr:fly)))</str>
<str name="parsedquery_toString">+((ocr:fire ocr:fly))</str>

Entered as separate words [fire fly]  numFound="184962
 edismax mm=2
<lst name="debug">
<str name="rawquerystring">{!edismax mm=2}fire fly</str>
<str name="querystring">{!edismax mm=2}fire fly</str>
<str name="parsedquery">
+((DisjunctionMaxQuery((ocr:fire)) DisjunctionMaxQuery((ocr:fly)))~2)

Regular Boolean AND query:   [fire AND fly] numFound="184962
<str name="rawquerystring">fire AND fly</str>
<str name="querystring">fire AND fly</str>
<str name="parsedquery">+ocr:fire +ocr:fly</str>
<str name="parsedquery_toString">+ocr:fire +ocr:fly</str>

Regular Boolean OR query: fire OR fly 366047  numFound="366047"
<lst name="debug">
<str name="rawquerystring">fire OR fly</str>
<str name="querystring">fire OR fly</str>
<str name="parsedquery">ocr:fire ocr:fly</str>
<str name="parsedquery_toString">ocr:fire ocr:fly</str>

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