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https://issues.apache.org/jira/browse/LUCENE-7824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16008209#comment-16008209
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Matt Weber commented on LUCENE-7824:
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[~jim.ferenczi] Maybe use a {{BytesRefHash}} and maintain a id-to-hash map so
we still only have single copy of common term in memory and still have a unique
id?
> Multi-word synonyms rule with common terms at the same position are buggy
> -------------------------------------------------------------------------
>
> Key: LUCENE-7824
> URL: https://issues.apache.org/jira/browse/LUCENE-7824
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Jim Ferenczi
> Attachments: LUCENE-7824.patch
>
>
> The automaton built from the graph token stream tries to pack common terms in
> multi word synonyms that appear at the same position. This means that some
> states inside a multi word synonym can have multiple transitions.
> As a result the intersection point of the graph are not computed correctly.
> For example the synonym rule: "ny, new york city, new york" is not applied
> correctly to the query "ny police".
> In this case "police" is detected as part of the multi synonyms path and we
> create the disjunction between:
> "ny police", "new york police", ...
> I pushed a patch that removes this optim (and creates a single transition
> from each state) in order to ensure that the intersection points of the graph
> always showed up at the end of the multi synonym paths.
> [~mattweber] can you take a look ?
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