Jim Ferenczi created LUCENE-7824:
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Summary: 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
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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