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https://issues.apache.org/jira/browse/LUCENE-4981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650177#comment-13650177
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Adrien Grand commented on LUCENE-4981:
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bq. why are offsets a problem?
There are invariants that need to be maintained by token filters: all tokens
that start at the same position must have the same start offset and all tokens
that end at the same position (start position + position length) must have the
same end offset (see ValidatingFilter). By arbitrarily changing position
increments, PositionFilter breaks these invariants.
> Deprecate PositionFilter
> ------------------------
>
> Key: LUCENE-4981
> URL: https://issues.apache.org/jira/browse/LUCENE-4981
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-4981.patch
>
>
> According to the documentation
> (http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters#solr.PositionFilterFactory),
> PositionFilter is mainly useful to make query parsers generate boolean
> queries instead of phrase queries although this problem can be solved at
> query parsing level instead of analysis level (eg. using
> QueryParser.setAutoGeneratePhraseQueries).
> So given that PositionFilter corrupts token graphs (see TestRandomChains), I
> propose to deprecate it.
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