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Posted to dev@lucene.apache.org by "Eric Bus (JIRA)" <ji...@apache.org> on 2014/02/05 12:32:09 UTC
[jira] [Commented] (SOLR-5379) Query-time multi-word synonym
expansion
[ https://issues.apache.org/jira/browse/SOLR-5379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13892010#comment-13892010 ]
Eric Bus commented on SOLR-5379:
--------------------------------
Has anyone modified this patch to work on 4.6.1? I tried to do a manual merge for the second patch. But a lot has changed in the SolrQueryParserBase.java file.
> Query-time multi-word synonym expansion
> ---------------------------------------
>
> Key: SOLR-5379
> URL: https://issues.apache.org/jira/browse/SOLR-5379
> Project: Solr
> Issue Type: Improvement
> Components: query parsers
> Reporter: Tien Nguyen Manh
> Labels: multi-word, queryparser, synonym
> Fix For: 4.7
>
> Attachments: quoted.patch, synonym-expander.patch
>
>
> While dealing with synonym at query time, solr failed to work with multi-word synonyms due to some reasons:
> - First the lucene queryparser tokenizes user query by space so it split multi-word term into two terms before feeding to synonym filter, so synonym filter can't recognized multi-word term to do expansion
> - Second, if synonym filter expand into multiple terms which contains multi-word synonym, The SolrQueryParseBase currently use MultiPhraseQuery to handle synonyms. But MultiPhraseQuery don't work with term have different number of words.
> For the first one, we can extend quoted all multi-word synonym in user query so that lucene queryparser don't split it. There are a jira task related to this one https://issues.apache.org/jira/browse/LUCENE-2605.
> For the second, we can replace MultiPhraseQuery by an appropriate BoleanQuery SHOULD which contains multiple PhraseQuery in case tokens stream have multi-word synonym.
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