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The following page has been changed by HossMan: http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters The comment on the change is: fixing non-wikiwords ------------------------------------------------------------------------------ }}} - Keep in mind that while the SynonymFilter will happily work with symonyms containing multiple words (ie: "`sea biscuit, sea biscit, seabiscuit`") The recommended approach for dealing with synonyms like this, is to expand the synonym when indexing. This is because there are two potential issues that can arrise at query time: + Keep in mind that while the !SynonymFilter will happily work with symonyms containing multiple words (ie: "`sea biscuit, sea biscit, seabiscuit`") The recommended approach for dealing with synonyms like this, is to expand the synonym when indexing. This is because there are two potential issues that can arrise at query time: - 1. The Lucene QueryParser tokenizes on white space before giving any text to the Analyzer, so if a person searches for the words `sea biscit` the analyzer will be given the words "sea" and "biscit" seperately, and will not know that they match a synonym. + 1. The Lucene !QueryParser tokenizes on white space before giving any text to the Analyzer, so if a person searches for the words `sea biscit` the analyzer will be given the words "sea" and "biscit" seperately, and will not know that they match a synonym. - 1. Phrase searching (ie: `"sea biscit"`) will cause the QueryParser to pass the entire string to the analyzer, but if the SynonymFilter is configured to expand the synonyms, then when the QueryParser gets the resulting list of tokens back from the Analyzer, it will construct a MultiPhraseQuery that will not have the desired effect. This is because of the limited mechanism available for the Analyzer to indicate that two terms occupy the same position: there is no way to indicate that a "phrase" occupies the same position as a term. For our example the resulting MultiPhraseQuery would be `"(sea | sea | seabiscuit) (biscuit | biscit)"` which would not match the simple case of "seabisuit" occuring in a document + 1. Phrase searching (ie: `"sea biscit"`) will cause the !QueryParser to pass the entire string to the analyzer, but if the !SynonymFilter is configured to expand the synonyms, then when the !QueryParser gets the resulting list of tokens back from the Analyzer, it will construct a !MultiPhraseQuery that will not have the desired effect. This is because of the limited mechanism available for the Analyzer to indicate that two terms occupy the same position: there is no way to indicate that a "phrase" occupies the same position as a term. For our example the resulting !MultiPhraseQuery would be `"(sea | sea | seabiscuit) (biscuit | biscit)"` which would not match the simple case of "seabisuit" occuring in a document
