Github user jpountz commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/345#discussion_r180494440
--- Diff: lucene/core/src/java/org/apache/lucene/search/Weight.java ---
@@ -69,6 +69,24 @@ protected Weight(Query query) {
*/
public abstract void extractTerms(Set<Term> terms);
+ /**
+ * Returns {@link Matches} for a specific document, or {@code null} if
the document
+ * does not match the parent query
+ *
+ * A query match that contains no position information (for example, a
Point or
+ * DocValues query) will return {@link Matches#MATCH_WITH_NO_TERMS}
+ *
+ * @param context the reader's context to create the {@link Matches} for
+ * @param doc the document's id relative to the given context's
reader
+ */
+ public Matches matches(LeafReaderContext context, int doc) throws
IOException {
+ Scorer scorer = scorer(context);
+ if (scorer == null || scorer.iterator().advance(doc) != doc) {
--- End diff --
we might want to check the two-phase iterator instead if there is one so
that `iterator().advance()` doesn't potentially visit millions of candidates
before finding one that actually matches. See for instance
ConstantScoreWeight.explain.
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