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From "Tom Burton-West (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3589) Edismax parser does not honor mm parameter if analyzer splits a token
Date Tue, 06 Nov 2012 22:58:12 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491922#comment-13491922
] 

Tom Burton-West commented on SOLR-3589:
---------------------------------------

I back-ported to 3.6 branch.  Forgot to change the name from SOLR-3589.patch, so the 6/Nov/12
patch is the 3.6 patch against yesterdays svn version of 3.6.

Main difference I saw between 3.6 and 4.0 is that Solr 4.0 uses DisMaxQParser.parseMinShouldMatch()
to set the default at 0% if q.op=OR and %100 if q.op =AND

I just kept the 3.6 behavior which uses 3.6 default of 100% (if mm is not set)

I'll test the 3.6 patch against a production index tomorrow.
     


                
> Edismax parser does not honor mm parameter if analyzer splits a token
> ---------------------------------------------------------------------
>
>                 Key: SOLR-3589
>                 URL: https://issues.apache.org/jira/browse/SOLR-3589
>             Project: Solr
>          Issue Type: Bug
>          Components: search
>    Affects Versions: 3.6, 4.0-BETA
>            Reporter: Tom Burton-West
>            Assignee: Robert Muir
>         Attachments: SOLR-3589.patch, SOLR-3589.patch, SOLR-3589.patch, SOLR-3589.patch,
SOLR-3589.patch, SOLR-3589_test.patch, testSolr3589.xml.gz, testSolr3589.xml.gz
>
>
> With edismax mm set to 100%  if one of the tokens is split into two tokens by the analyzer
chain (i.e. "fire-fly"  => fire fly), the mm parameter is ignored and the equivalent of
 OR query for "fire OR fly" is produced.
> This is particularly a problem for languages that do not use white space to separate
words such as Chinese or Japenese.
> See these messages for more discussion:
> http://lucene.472066.n3.nabble.com/edismax-parser-ignores-mm-parameter-when-tokenizer-splits-tokens-hypenated-words-WDF-splitting-etc-tc3991911.html
> http://lucene.472066.n3.nabble.com/edismax-parser-ignores-mm-parameter-when-tokenizer-splits-tokens-i-e-CJK-tc3991438.html
> http://lucene.472066.n3.nabble.com/Why-won-t-dismax-create-multiple-DisjunctionMaxQueries-when-autoGeneratePhraseQueries-is-false-tc3992109.html

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