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Posted to dev@lucene.apache.org by "Otis Gospodnetic (JIRA)" <ji...@apache.org> on 2015/02/02 17:32:34 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=14301433#comment-14301433 ]
Otis Gospodnetic commented on SOLR-5379:
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Is there any interest in committing this to 4.x or 5.x? We have a client at Sematext who needs query-time synonym support for their Solr 4.x setup. So we can make sure this patch works for 4.x. If any of the Solr developers wants to commit this to 5.x, please leave a comment here.
> 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: 4.9, Trunk
>
> Attachments: conf-test-files-4_8_1.patch, quoted-4_8_1.patch, quoted.patch, synonym-expander-4_8_1.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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