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https://issues.apache.org/jira/browse/SOLR-4647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13692831#comment-13692831
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Sebastian Müller commented on SOLR-4647:
----------------------------------------
think I hit that problem. Create a schema with normal fields (e.g. id)
and an DocValues field (e.g. feature). If you want to get the DocValues
field value (/select?q=id:123&fl=feature) no value is returned.
Setting the DocValues field stored=true or false doesn't change
anything. The value is not returned.
We worked around that by using an own Field implementation that
programmatically set the stored flag true:
public class OwnDocValuesField extends Field {
public static final FieldType TYPE = new FieldType();
static {
TYPE.setDocValueType(FieldInfo.DocValuesType.BINARY);
//set to true, so we are able to retrieve the docvalues via fl
parameter
TYPE.setStored(true);
TYPE.freeze();
}
public OwnDocValuesField(String name, BytesRef value) {
super(name, TYPE);
fieldsData = value;
}
}
We use this class in an own FieldType implementation. I guess our
problem is caused by the issue described in SOLR-4647.
I cannot estimate if this is a bug or if DocValues works as designed,
and simply should not be used this way. Does anyone know that?
lg
Sebastian
> Grouping is broken on docvalues-only fields
> -------------------------------------------
>
> Key: SOLR-4647
> URL: https://issues.apache.org/jira/browse/SOLR-4647
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.2
> Reporter: Adrien Grand
> Labels: newdev
>
> There are a few places where grouping uses
> FieldType.toObject(SchemaField.createField(String, float)) to translate a
> String field value to an Object. The problem is that createField returns null
> when the field is neither stored nor indexed, even if it has doc values.
> An option to fix it could be to use the ValueSource instead to resolve the
> Object value (similarily to NumericFacets).
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