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https://issues.apache.org/jira/browse/LUCENE-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12741730#action_12741730
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Paul Elschot commented on LUCENE-533:
-------------------------------------
One problem here is that the Spans interface does not have a property for a
weight value.
So one way to start this could be to deprecate Spans and to define something
like this:
{code}
public abstract class WeightedSpans implements Spans {
... abstract methods as in Spans interface;
public float getValue()
// implement getValue here to allow WeightedSpans to replace Spans everywhere
{ return 1.0; }
}
{code}
> SpanQuery scoring: SpanWeight lacks a recursive traversal of the query tree
> ---------------------------------------------------------------------------
>
> Key: LUCENE-533
> URL: https://issues.apache.org/jira/browse/LUCENE-533
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Affects Versions: 1.9
> Reporter: Vincent Le Maout
> Priority: Minor
>
> I found the computing of weights to be somewhat different according to the
> query type (BooleanQuery versus SpanQuery) :
> org.apache.lucene.search.BooleanQuery.BooleanWeight :
> public BooleanWeight(Searcher searcher)
> throws IOException {
> this.similarity = getSimilarity(searcher);
> for (int i = 0 ; i < clauses.size(); i++) {
> BooleanClause c = (BooleanClause)clauses.elementAt(i);
> weights.add(c.getQuery().createWeight(searcher));
> }
> }
> which looks like a recursive descent through the tree, taking into account
> the weights of all the nodes, whereas :
> org.apache.lucene.search.spans.SpanWeight :
> public SpanWeight(SpanQuery query, Searcher searcher)
> throws IOException {
> this.similarity = query.getSimilarity(searcher);
> this.query = query;
> this.terms = query.getTerms();
> idf = this.query.getSimilarity(searcher).idf(terms, searcher);
> }
> lacks any traversal and according to what I have understood so far from the
> rest
> of the code, only takes into account the boost of the tree root in
> SumOfSquareWeights(),
> which is consistent with the resulting scores not considering the boost of
> the tree
> leaves.
> vintz
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