mikemccand commented on a change in pull request #923: LUCENE-8988: Introduce
Global Feature Based Early Termination For Sorted Fields
URL: https://github.com/apache/lucene-solr/pull/923#discussion_r335024999
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File path:
lucene/core/src/java/org/apache/lucene/search/LeafFieldComparator.java
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@@ -116,4 +116,12 @@
* obtain the current hit's score, if necessary. */
void setScorer(Scorable scorer) throws IOException;
+ /** Publishes feature values for the given docID
+ * The passed in docID values should only move ahead --
+ * DocValues do not support reverse iterations.
+ * WARNING: Can be a costly API, especially for sorted fields
+ *
+ * @param doc docID relative to current reader
+ */
+ T getDocValue(int doc) throws IOException;
Review comment:
Is this supposed to be an optional API, i.e. an impl can choose to return
`null` and then the optimization we are adding here simply won't run?
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