Nguyen Manh Tien created SOLR-5379:
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Summary: Multi-word synonym filter
Key: SOLR-5379
URL: https://issues.apache.org/jira/browse/SOLR-5379
Project: Solr
Issue Type: Improvement
Components: query parsers
Reporter: Nguyen Manh Tien
Priority: Minor
Fix For: 4.5.1
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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