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From "Timothy Garafola (JIRA)" <>
Subject [jira] [Commented] (SOLR-5379) Query-time multi-word synonym expansion
Date Tue, 21 Jul 2015 22:03:07 GMT


Timothy Garafola commented on SOLR-5379:

Is there a status on this issue?  Did it get moved forward to 5.x?  Is it available in 4.10?

> Query-time multi-word synonym expansion
> ---------------------------------------
>                 Key: SOLR-5379
>                 URL:
>             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, solr-5379-version-4.10.3.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
> 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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