Lucene highlighting unable to extract terms from sub-query of a FunctionQuery
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Key: SOLR-2681
URL: https://issues.apache.org/jira/browse/SOLR-2681
Project: Solr
Issue Type: Bug
Components: highlighter
Affects Versions: 3.3
Reporter: Nicolas Marchildon
When using a function query with an argument being a term query, I would expect
the highlighter to be able to extract the term.
Lucene's WeightedSpanTermExtractor used by QueryScorer does not know about
FunctionQuery, so it is not able to recurse into it for extracting terms.
Here's a HighlighterTest that I believe reproduces the behavior I'm seeing:
{code}
public void testHighlightFunction() {
assertU(adoc("t_text", "lorem ipsum", "id", "1"));
assertU(commit());
assertQ("function highlighting",
req("q", "{!func}product($v1,$v2)", "v1", "{!dismax
qf=t_text}lorem", "v2", "100.0", "hl", "true", "hl.fl", "t_text"),
"//lst[@name='highlighting']/lst[@name='1']" +
"/arr[@name='t_text']/str='<em>lorem</em> ipsum'");
}
{code}
The WeightedSpanTermExtractor does many {{instanceof}}, in which Solr's
FunctionQuery is unknown. Solr should provide a QueryScorer that knows how to
extract terms from a QueryValueSource inside a FunctionQuery.
Here's the stack that leads to the term extraction:
{code}
Thread [main] (Suspended (breakpoint at line 106 in WeightedSpanTermExtractor))
WeightedSpanTermExtractor.extract(Query, Map) line: 106
WeightedSpanTermExtractor.getWeightedSpanTerms(Query, TokenStream,
String) line: 414
QueryScorer.initExtractor(TokenStream) line: 216
QueryScorer.init(TokenStream) line: 184
Highlighter.getBestTextFragments(TokenStream, String, boolean, int)
line: 226
Highlighter.getBestFragments(TokenStream, String, int) line: 184
Highlighter.getBestFragment(TokenStream, String) line: 107
Highlighter.getBestFragment(Analyzer, String, String) line: 85
{code}
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