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https://issues.apache.org/jira/browse/LUCENE-5252?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koji Sekiguchi updated LUCENE-5252:
-----------------------------------
Attachment: LUCENE-5252_4x.patch
New patch that has tests.
Because the original test was developed in RONDHUIT and it includes test codes
for not only NGramSynonymTokenizer but also synonym dictionary, the attached
tests may be redundant in terms of SynonymMap.
> add NGramSynonymTokenizer
> -------------------------
>
> Key: LUCENE-5252
> URL: https://issues.apache.org/jira/browse/LUCENE-5252
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Koji Sekiguchi
> Priority: Minor
> Attachments: LUCENE-5252_4x.patch, LUCENE-5252_4x.patch
>
>
> I'd like to propose that we have another n-gram tokenizer which can process
> synonyms. That is NGramSynonymTokenizer. Note that in this ticket, the gram
> size is fixed, i.e. minGramSize = maxGramSize.
> Today, I think we have the following problems when using SynonymFilter with
> NGramTokenizer.
> For purpose of illustration, we have a synonym setting "ABC, DEFG" w/
> expand=true and N = 2 (2-gram).
> # There is no consensus (I think :-) how we assign offsets to generated
> synonym tokens DE, EF and FG when expanding source token AB and BC.
> # If the query pattern looks like XABC or ABCY, it cannot be matched even if
> there is a document "…XABCY…" in index when autoGeneratePhraseQueries set to
> true, because there is no "XA" or "CY" tokens in the index.
> NGramSynonymTokenizer can solve these problems by providing the following
> methods.
> * NGramSynonymTokenizer reads synonym settings (synonyms.txt) and it doesn't
> tokenize registered words. e.g.
> ||source text||NGramTokenizer+SynonymFilter||NGramSynonymTokenizer||
> |ABC|AB/DE/BC/EF/FG|ABC/DEFG|
> * The back and forth of the registered words, NGramSynonymTokenizer generates
> *extra* tokens w/ posInc=0. e.g.
> ||source text||NGramTokenizer+SynonymFilter||NGramSynonymTokenizer||
> |XYZABC123|XY/YZ/ZA/AB/DE/BC/EF/C1/FG/12/23|XY/YZ/Z/ABC/DEFG/1/12/23|
> In the above sample, "Z" and "1" are the extra tokens.
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