jpountz commented on a change in pull request #680: LUCENE-8803: Provide a
FieldComparator to allow sorting by a feature from a FeatureField
URL: https://github.com/apache/lucene-solr/pull/680#discussion_r286102178
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File path: lucene/core/src/java/org/apache/lucene/document/FeatureField.java
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@@ -518,4 +521,22 @@ static float computePivotFeatureValue(IndexReader reader,
String featureField, S
float avgFreq = (float) ((double) states.totalTermFreq() /
states.docFreq());
return decodeFeatureValue(avgFreq);
}
+
+ /**
+ * Creates a SortField for sorting by the value of a feature.
+ * <p>
+ * This sort orders documents by descending value of a feature. The value
returned in {@link FieldDoc} for
+ * the hits contains a Float instance with the feature value.
+ * <p>
+ * If a document is missing the field, then it is treated as having a vaue
of <code>0.0f</code>.
+ * <p>
+ *
+ * @param field field name. Must not be null.
+ * @param featureName feature name. Must not be null.
+ * @return SortField ordering documents by the value of the feature
+ * @throws IllegalArgumentException if {@code field} or {@code featureName}
is null.
+ */
+ public static SortField newFeatureSort(String field, BytesRef featureName) {
Review comment:
can it take a String featureName like the query?
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