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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.fetch.subphase;
import org.elasticsearch.index.fielddata.AtomicFieldData;
import org.elasticsearch.index.fielddata.ScriptDocValues;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.search.SearchHitField;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
/**
* Query sub phase which pulls data from doc values
*
* Specifying {@code "docvalue_fields": ["field1", "field2"]}
*/
public final class DocValueFieldsFetchSubPhase implements FetchSubPhase {
@Override
public void hitExecute(SearchContext context, HitContext hitContext) throws IOException {
if (context.collapse() != null) {
// retrieve the `doc_value` associated with the collapse field
String name = context.collapse().getFieldType().name();
if (context.docValueFieldsContext() == null) {
context.docValueFieldsContext(new DocValueFieldsContext(Collections.singletonList(name)));
} else if (context.docValueFieldsContext().fields().contains(name) == false) {
context.docValueFieldsContext().fields().add(name);
}
}
if (context.docValueFieldsContext() == null) {
return;
}
for (String field : context.docValueFieldsContext().fields()) {
if (hitContext.hit().fieldsOrNull() == null) {
hitContext.hit().fields(new HashMap<>(2));
}
SearchHitField hitField = hitContext.hit().getFields().get(field);
if (hitField == null) {
hitField = new SearchHitField(field, new ArrayList<>(2));
hitContext.hit().getFields().put(field, hitField);
}
MappedFieldType fieldType = context.mapperService().fullName(field);
if (fieldType != null) {
/* Because this is called once per document we end up creating a new ScriptDocValues for every document which is important
* because the values inside ScriptDocValues might be reused for different documents (Dates do this). */
AtomicFieldData data = context.fieldData().getForField(fieldType).load(hitContext.readerContext());
ScriptDocValues<?> values = data.getScriptValues();
values.setNextDocId(hitContext.docId());
hitField.getValues().addAll(values);
}
}
}
}