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https://issues.apache.org/jira/browse/SOLR-2681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SOLR-2681:
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Labels: pull-request-available (was: )
> Lucene highlighting unable to extract terms from sub-query of a FunctionQuery
> -----------------------------------------------------------------------------
>
> 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
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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