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https://issues.apache.org/jira/browse/LUCENE-3475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16395140#comment-16395140
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Alan Woodward commented on LUCENE-3475:
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Updated patch:
* trailing terms that would produce shingles < minShingleLength are emitted as
single tokens
* all shingles have positionLength=1, which fixes issues with QueryBuilder
* added tests using CannedTokenStream from FlattenGraphFilter
Some of this behaviour is different to the standard ShingleFilter, so I think
we should probably keep them separate (while deprecating the old version and
removing in master)
> ShingleFilter should handle positionIncrement of zero, e.g. synonyms
> --------------------------------------------------------------------
>
> Key: LUCENE-3475
> URL: https://issues.apache.org/jira/browse/LUCENE-3475
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/analysis
> Reporter: Cameron
> Assignee: Alan Woodward
> Priority: Minor
> Labels: newdev
> Attachments: LUCENE-3475.patch, LUCENE-3475.patch
>
>
> ShingleFilter is creating shingles for a single term that has been expanded
> by synonyms when it shouldn't. The position increment is 0.
> As an example, I have an Analyzer with a SynonymFilter followed by a
> ShingleFilter. Assuming car and auto are synonyms, the SynonymFilter produces
> two tokens and position 1: car, auto. The ShingleFilter is then producing 3
> tokens, when there should only be two: car, car auto, auto. This behavior
> seems incorrect.
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