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https://issues.apache.org/jira/browse/SOLR-5379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865335#comment-13865335
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Markus Jelsma commented on SOLR-5379:
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Nolan, Jan, both of you have extensive knowledge about the one you worked on
hosted on github. How do you compare features? I've checked your issue list and
there are no new issues coming in and a lot have been resolved already, looks
like that one is much more mature and flexible/configurable.
> 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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