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https://issues.apache.org/jira/browse/LUCENE-6400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14498583#comment-14498583
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Ian Ribas commented on LUCENE-6400:
-----------------------------------
Sorry, looked at it again and saw that actually, if that mapping was absent, it
would be even better. There would be no match and the term would stay there
with type word, and not SYNONYM.
> SynonymParser should encode 'expand' correctly.
> -----------------------------------------------
>
> Key: LUCENE-6400
> URL: https://issues.apache.org/jira/browse/LUCENE-6400
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
> Attachments: LUCENE-6400.patch, LUCENE-6400.patch, LUCENE-6400.patch,
> LUCENE-6400.patch, PositionLenghtAndType-unittests.patch,
> unittests-expand-and-parse.patch
>
>
> Today SolrSynonymParser encodes something like A, B, C with 'expand=true'
> like this:
> A -> A, B, C (includeOrig=false)
> B -> B, A, C (includeOrig=false)
> C -> C, A, B (includeOrig=false)
> This gives kinda buggy output (synfilter sees it all as replacements, and
> makes all the terms with type synonym, positionLength isnt supported, etc)
> and it wastes space in the FST (includeOrig is just one bit).
> Example with "spiderman, spider man" and analysis on 'spider man'
> Trunk:
> term=spider,startOffset=0,endOffset=6,positionIncrement=1,positionLength=1,*type=SYNONYM*
> term=spiderman,startOffset=0,endOffset=10,positionIncrement=0,*positionLength=1*,type=SYNONYM
> term=man,startOffset=7,endOffset=10,positionIncrement=1,positionLength=1,*type=SYNONYM*
> You can see this is confusing, all the words have type SYNONYM, because
> spider and man got deleted, and totally replaced by new terms (Which happen
> to have the same text).
> Patch:
> term=spider,startOffset=0,endOffset=6,positionIncrement=1,positionLength=1,*type=word*
> term=spiderman,startOffset=0,endOffset=10,positionIncrement=0,*positionLength=2*,type=SYNONYM
> term=man,startOffset=7,endOffset=10,positionIncrement=1,positionLength=1,*type=word*
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