Implement boundary match support
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Key: SOLR-1980
URL: https://issues.apache.org/jira/browse/SOLR-1980
Project: Solr
Issue Type: New Feature
Components: Schema and Analysis
Reporter: Jan Høydahl
Sometimes you need to specify that a query should match only at the start or
end of a field, or be an exact match.
Example content:
1) a quick fox is brown
2) quick fox is brown
Example queries:
"^quick fox" -> should only match 2)
"brown$" -> should match 1) and 2)
"^quick fox is brown$" -> should only match 2)
Proposed way of implmementation is through a new BoundaryMatchTokenFilter which
behaves like this:
On the index side it inserts special unique tokens at beginning and end of
field. These could be some weird unicode sequence.
On the query side, it looks for the first character matching "^" or the last
character matching "$" and replaces them with the special tokens.
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