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https://issues.apache.org/jira/browse/SOLR-12697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17340860#comment-17340860
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Tom Gilke commented on SOLR-12697:
----------------------------------
Hello,
Tobi and I used the following approach to tackle the problem:
{code:java}
public class DocValuesFieldValueFeatureScorer extends FieldValueFeatureScorer {
final LeafReaderContext context;
NumericDocValues floatDocValues;
public DocValuesFieldValueFeatureScorer(final FeatureWeight weight, final
LeafReaderContext context, final DocIdSetIterator itr) {
super(weight, context, itr);
this.context = context;
try {
floatDocValues = DocValues.getNumeric(context.reader(), field);
} catch (IOException e) {
// this is fine for fields that do not have docValues, we handle
that case with super.score()
floatDocValues = null;
}
}
@Override
public float score() throws IOException {
if (floatDocValues != null && floatDocValues.advanceExact(itr.docID()))
{
// convert float value that was stored as long back to float
if (NumberType.FLOAT.equals(docValuesType)) {
return Float.intBitsToFloat((int) floatDocValues.longValue());
// just take the long value
} else if (NumberType.LONG.equals(docValuesType)) {
return floatDocValues.longValue();
} else {
throw new IllegalArgumentException(String.format("%s type of
field %s is not supported!", docValuesType, field));
}
} else {
// use stored field values, fallback to default behavior in
FieldValueFeature
return super.score();
}
}
}{code}
Does that help with the problem of using the docFetcher?
If so, than we could improve the code and contribute it.
> pure DocValues support for FieldValueFeature
> --------------------------------------------
>
> Key: SOLR-12697
> URL: https://issues.apache.org/jira/browse/SOLR-12697
> Project: Solr
> Issue Type: Sub-task
> Components: contrib - LTR
> Reporter: Stanislav Livotov
> Priority: Major
> Attachments: SOLR-12697.patch, SOLR-12697.patch, SOLR-12697.patch,
> SOLR-12697.patch, SOLR-12697.patch
>
>
> [~slivotov] wrote in SOLR-12688:
> bq. ... FieldValueFeature doesn't support pure DocValues fields (Stored
> false). Please also note that for fields which are both stored and DocValues
> it is working not optimal because it is extracting just one field from the
> stored document. DocValues are obviously faster for such usecases. ...
> (Please see SOLR-12688 description for overall context and analysis results.)
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