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https://issues.apache.org/jira/browse/SOLR-5379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13814281#comment-13814281
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Bill Steele commented on SOLR-5379:
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We found this to be much more useful code for multiword synonyms. We ran some
tests, and when having a synonym set such as:
seabiscuit, sea biscuit, sea biscit
Search on the following:
seabiscuit article
Returned matches with the following terms
Sea biscit article
Sea biscuit article
Seabiscuit article
Biscuit Sea article
Sea article
Biscit article
With this patch, the above search query just returned the terms:
Sea biscit article
Sea biscuit article
Seabiscuit article
> 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: Nguyen Manh Tien
> Labels: multi-word, queryparser, synonym
> Fix For: 4.5.1, 4.6
>
> 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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