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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] [Created] (LUCENE-8137) GraphTokenStreamFiniteStrings does
not handle position inc > 1 in multi-word synoyms
Jim Ferenczi created LUCENE-8137:
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Summary: 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: 7.2.1, master (8.0)
Reporter: Jim Ferenczi
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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