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https://issues.apache.org/jira/browse/SOLR-5379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13803199#comment-13803199
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Otis Gospodnetic commented on SOLR-5379:
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My understanding of how this synonym expander (the synonym-expander.patch)
works is:
Assume synonyms are:
{code}
Seabiscuit, Sea biscit, Biscit
{code}
For query "Seabiscuit article", the regular edismax will construct a
MultiPhraseQuery like ("Seebiscuit|Sea|biscit", biscit, article").
Instead of that, this patch rewrites the query differently:
PhraseQuery(Seabiscit article) OR PhraseQuery(Sea biscit article) OR
PhraseQuery(biscit 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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