Jan Høydahl created SOLR-8737:
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Summary: Managed synonym lists do not include the original term in
the expand
Key: SOLR-8737
URL: https://issues.apache.org/jira/browse/SOLR-8737
Project: Solr
Issue Type: Bug
Components: Schema and Analysis
Affects Versions: 5.5
Reporter: Jan Høydahl
Fix For: 5.5.1
Spinoff from discussion in solr-user list
http://find.searchhub.org/document/8dfce8a277de0f2a
The managed synonyms filter does not behave the same way as the original
synonym filter when a list is added. The original synonyms filter with default
{{expand=true}} produces the following map when parsing a line:
Input:
{noformat}
a, b, c
{noformat}
Becomes:
{noformat}
a => a, b, c
b => a, b, c
c => a, b, c
{noformat}
But the managed filter excludes the original term in the mapping, so an input
{{\["a", "b", "c"\]}} becomes:
{noformat}
a => b, c
b => a, c
c => a, b
{noformat}
This can also be seen in {{TestManagedSynonymFilterFactory.java}} where it is
tested explicitly, while the tests for the file based synonymfilter expect an
all-way expand including the original term.
This causes a query for "a" to *not* match documents with the term "a", but
only those with term "b" or "c".
The offending line in {{ManagedSynonymFilterFactory}} is this
{code}
188: treeTerms.remove(origTerm);
{code}
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