tomglk commented on a change in pull request #123:
URL: https://github.com/apache/solr/pull/123#discussion_r633270956
##########
File path:
solr/contrib/ltr/src/java/org/apache/solr/ltr/feature/FieldValueFeature.java
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@@ -106,18 +106,29 @@ public FieldValueFeatureWeight(IndexSearcher searcher,
/**
* Return a FeatureScorer that uses docValues or storedFields if no
docValues are present
+ *
* @param context the segment this FeatureScorer is working with
* @return FeatureScorer for the current segment and field
* @throws IOException as defined by abstract class Feature
*/
@Override
public FeatureScorer scorer(LeafReaderContext context) throws IOException {
if (schemaField != null && !schemaField.stored() &&
schemaField.hasDocValues()) {
- return new DocValuesFieldValueFeatureScorer(this, context,
- DocIdSetIterator.all(DocIdSetIterator.NO_MORE_DOCS),
schemaField.getType());
+
+ FieldInfo fieldInfo =
context.reader().getFieldInfos().fieldInfo(field);
+ DocValuesType docValuesType = fieldInfo != null ?
fieldInfo.getDocValuesType() : DocValuesType.NONE;
+
+ if (DocValuesType.NUMERIC.equals(docValuesType) ||
DocValuesType.SORTED.equals(docValuesType)) {
+ return new DocValuesFieldValueFeatureScorer(this, context,
+ DocIdSetIterator.all(DocIdSetIterator.NO_MORE_DOCS),
schemaField.getType(), docValuesType);
+ // If type is NONE, this segment has no docs with this field. That's
not a problem, because we won't call score() anyway
Review comment:
Great observation! I completely overlooked this.
Your reasoning makes complete sense to me and some debugging verified the
behavior you described.
Even if it may be an edge case, I think it makes sense to make it explicit.
In terms of performance you are also right. Trying to read the stored fields
before returning the default value surely is more costly than just returning
the value.
I started to create a `DefaultValueFieldValueFeatureScorer` that always
returns the default value, but until now I am struggling to find a way to test
this.
I hope your bike is well now! :)
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