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https://issues.apache.org/jira/browse/LUCENE-4991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-4991.
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Resolution: Fixed
Fix Version/s: 4.4
5.0
> QueryParser doesnt handle synonyms correctly for chinese
> --------------------------------------------------------
>
> Key: LUCENE-4991
> URL: https://issues.apache.org/jira/browse/LUCENE-4991
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/queryparser
> Reporter: Robert Muir
> Fix For: 5.0, 4.4
>
> Attachments: LUCENE-4991.patch
>
>
> As reported multiple times on the user list:
> http://find.searchhub.org/document/eaf0e88a6a0d4d1f
> http://find.searchhub.org/document/abf28043c52b6efc
> http://find.searchhub.org/document/1313794632c90826
> The logic here is not forming the right query structures and ignoring
> positionIncrementAttribute from the tokenStream.
> * when default operator is AND, you can see it more clearly, as synonyms are
> wrongly inserted as additional MUST terms:
> expected:<+field:中 +(field:国 field:國)>
> but was:<+field:中 +field:国 +field:國>
> * even when default operator is OR, its still wrong, because we ignore posInc
> and this means coord computation is not correct (so scoring is wrong)
> This also screws up scoring and queries for decompounding too (because they
> go thru this exact situation if they add the original compound as a synonym).
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