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Posted to dev@lucene.apache.org by "Jim Ferenczi (JIRA)" <ji...@apache.org> on 2018/01/24 10:44:00 UTC
[jira] [Assigned] (LUCENE-8137) GraphTokenStreamFiniteStrings does
not handle position inc > 1 in multi-word synoyms
[ https://issues.apache.org/jira/browse/LUCENE-8137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jim Ferenczi reassigned LUCENE-8137:
------------------------------------
Assignee: Jim Ferenczi
> GraphTokenStreamFiniteStrings does not handle position inc > 1 in multi-word synoyms
> ------------------------------------------------------------------------------------
>
> Key: LUCENE-8137
> URL: https://issues.apache.org/jira/browse/LUCENE-8137
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: master (8.0), 7.2.1
> Reporter: Jim Ferenczi
> Assignee: Jim Ferenczi
> Priority: Major
>
> The automaton built for graph queries that contain multiple multi-word synonyms does not handle gaps if they appear in the middle of a multi-word synonym. In such case the token next to the gap is considered as part of the multi-word synonym.
> Stop words that appear before or after multi-word synonyms are handled correctly in the current version but the synonym rule "part of speech, pos" for instance does not create the expected query if "of" is removed by a filter that is set after the synonym_graph. One solution would be to reuse TokenStreamToAutomaton (with minor changes to add the ability to create token transitions rather than chars) which preserves gaps (as a transition) in the produced automaton.
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