Yes, highlighting multi-term queries does require a query.rewrite() call to expand
those terms before
calling the highlighter.
BUT, you could load the results documents into a temporary RAMDirectory and expand the
query by rewriting it
against THAT instead of the original index - it would still produce the term
expansions you need.
The trouble is that would require one pass of the analyzer over the full documents'
text.
You would have to tokenize the text again when you called the highlighter unless you
wrote code to cache the
results of the token stream created while indexing the results into your RamDirectory.
This pre-tokenized stream
could then be passed to the highlighter.
Another approach is to write your own "Scorer" implementation for use with the
highlighter - something like:
String wildcardTerms[]={"corporat","firm", "business","compan", "invest"}; //....
//this impl assumes all search terms are wildcards
public float getTokenScore(Token token)
{
for(int i=0;i<wildcardTerms;i++)
{
if(token.termText().startsWith(wildcardTerms[i]))
return 1;
}
return 0;
}
Wildcard support could be added as default functionality in the QueryScorer object for
un-rewritten queries
but I wanted to avoid re-implementing the various multi-term queries' logic in there.
Cheers
Mark
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