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https://issues.apache.org/jira/browse/LUCENE-1425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642650#action_12642650
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Yonik Seeley commented on LUCENE-1425:
--------------------------------------
It seems like we should separate the concepts of extracting terms from
highlighting.
There are scalability issues involved in enumerating all terms (both CPU and
especially memory), and it seems like we should avoid that if possible. What
about some kind of interface that would allow leaving these queries in symbolic
form?
{code}
class Query {
public boolean matches(Token t);
}
Or create an object optimized for matching for better speed:
class Query {
public TokenMatcher getTokenMatcher(IndexReader r);
}
class TokenMatcher {
public boolean matches(Token t); // returns true if the token is part of
this query
public float score(Token t); // returns <0 if no match
}
Or perhaps even better is something that takes a complete TokenStream and spits
back matches:
class TokenMatcher {
public void setTokenStream(TokenStream ts);
public boolean next(); // returns true if there is another match
public int getStartOffset();
public int getEndOffset();
public float getScore();
}
{code}
Basically, you want highlighting for a clause like a* to boil down to
tokenText.startsWith("a")
Does that make sense?
> Add ConstantScore highlighting support to SpanScorer
> ----------------------------------------------------
>
> Key: LUCENE-1425
> URL: https://issues.apache.org/jira/browse/LUCENE-1425
> Project: Lucene - Java
> Issue Type: New Feature
> Components: contrib/highlighter
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Minor
> Attachments: LUCENE-1425.patch
>
>
> Its actually easy enough to support the family of constantscore queries with
> the new SpanScorer. This will also remove the requirement that you rewrite
> queries against the main index before highlighting (in fact, if you do, the
> constantscore queries will not highlight).
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