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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.schema.processing;
import com.yahoo.config.application.api.DeployLogger;
import com.yahoo.schema.RankProfileRegistry;
import com.yahoo.schema.Schema;
import com.yahoo.schema.document.SDField;
import com.yahoo.schema.RankProfile;
import com.yahoo.vespa.model.container.search.QueryProfiles;
import java.util.Iterator;
/**
* Expresses literal boosts in terms of extra indices with rank boost.
* One extra index named <i>indexname</i>_exact is added for each index having
* a fields with literal-boosts of zero or more (zero to support other
* rank profiles setting a literal boost). Complete boost values in to fields
* are translated to rank boosts to the implementation indices.
* These indices has no positional
* or phrase support and contains concatenated versions of each field value
* of complete-boosted fields indexed to <i>indexname</i>. A search for indexname
* will be rewritten to also search <i>indexname</i>_exaxt
*
* @author bratseth
*/
public class LiteralBoost extends Processor {
public LiteralBoost(Schema schema, DeployLogger deployLogger, RankProfileRegistry rankProfileRegistry, QueryProfiles queryProfiles) {
super(schema, deployLogger, rankProfileRegistry, queryProfiles);
}
/** Adds extra search fields and indices to express literal boosts */
@Override
public void process(boolean validate, boolean documentsOnly) {
checkRankModifierRankType(schema);
addLiteralBoostsToFields(schema);
reduceFieldLiteralBoosts(schema);
}
/** Checks if literal boost is given using rank: , and set the actual literal boost accordingly. */
private void checkRankModifierRankType(Schema schema) {
for (SDField field : schema.allConcreteFields()) {
if (field.getLiteralBoost() > -1) continue; // Let explicit value take precedence
if (field.getRanking().isLiteral())
field.setLiteralBoost(100);
}
}
/**
* Ensures there are field boosts for all literal boosts mentioned in rank profiles.
* This is required because boost indices will only be generated by looking
* at field boosts
*/
private void addLiteralBoostsToFields(Schema schema) {
Iterator i = matchingRankSettingsIterator(schema, RankProfile.RankSetting.Type.LITERALBOOST);
while (i.hasNext()) {
RankProfile.RankSetting setting = (RankProfile.RankSetting)i.next();
SDField field = schema.getConcreteField(setting.getFieldName());
if (field == null) continue;
if (field.getLiteralBoost() < 0)
field.setLiteralBoost(0);
}
}
private void reduceFieldLiteralBoosts(Schema schema) {
for (SDField field : schema.allConcreteFields()) {
if (field.getLiteralBoost() < 0) continue;
reduceFieldLiteralBoost(field, schema);
}
}
private void reduceFieldLiteralBoost(SDField field, Schema schema) {
SDField literalField = addField(schema, field, "literal",
"{ input " + field.getName() + " | tokenize | index " + field.getName() + "_literal; }",
"literal-boost");
literalField.setWeight(field.getWeight() + field.getLiteralBoost());
}
}
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