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Adds advanced field mappers
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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.index.query;
import org.apache.lucene.document.FeatureField;
import org.apache.lucene.search.MatchNoDocsQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.ConstructingObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.index.mapper.RankFeatureFieldMapper.RankFeatureFieldType;
import org.elasticsearch.index.mapper.RankFeatureMetaFieldMapper;
import org.elasticsearch.index.mapper.RankFeaturesFieldMapper.RankFeaturesFieldType;
import org.elasticsearch.index.mapper.MappedFieldType;
import java.io.IOException;
import java.util.Arrays;
import java.util.Objects;
/**
* Query to run on a [rank_feature] field.
*/
public final class RankFeatureQueryBuilder extends AbstractQueryBuilder {
/**
* Scoring function for a [rank_feature] field.
*/
public abstract static class ScoreFunction {
private ScoreFunction() {} // prevent extensions by users
abstract void writeTo(StreamOutput out) throws IOException;
abstract Query toQuery(String field, String feature, boolean positiveScoreImpact) throws IOException;
abstract void doXContent(XContentBuilder builder) throws IOException;
/**
* A scoring function that scores documents as {@code Math.log(scalingFactor + S)}
* where S is the value of the static feature.
*/
public static class Log extends ScoreFunction {
private static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
"log", a -> new Log((Float) a[0]));
static {
PARSER.declareFloat(ConstructingObjectParser.constructorArg(), new ParseField("scaling_factor"));
}
private final float scalingFactor;
public Log(float scalingFactor) {
this.scalingFactor = scalingFactor;
}
private Log(StreamInput in) throws IOException {
this(in.readFloat());
}
@Override
public boolean equals(Object obj) {
if (obj == null || obj.getClass() != getClass()) {
return false;
}
Log that = (Log) obj;
return scalingFactor == that.scalingFactor;
}
@Override
public int hashCode() {
return Float.hashCode(scalingFactor);
}
@Override
void writeTo(StreamOutput out) throws IOException {
out.writeByte((byte) 0);
out.writeFloat(scalingFactor);
}
@Override
void doXContent(XContentBuilder builder) throws IOException {
builder.startObject("log");
builder.field("scaling_factor", scalingFactor);
builder.endObject();
}
@Override
Query toQuery(String field, String feature, boolean positiveScoreImpact) throws IOException {
if (positiveScoreImpact == false) {
throw new IllegalArgumentException("Cannot use the [log] function with a field that has a negative score impact as " +
"it would trigger negative scores");
}
return FeatureField.newLogQuery(field, feature, DEFAULT_BOOST, scalingFactor);
}
}
/**
* A scoring function that scores documents as {@code S / (S + pivot)} where S is
* the value of the static feature.
*/
public static class Saturation extends ScoreFunction {
private static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
"saturation", a -> new Saturation((Float) a[0]));
static {
PARSER.declareFloat(ConstructingObjectParser.optionalConstructorArg(), new ParseField("pivot"));
}
private final Float pivot;
/** Constructor with a default pivot, computed as the geometric average of
* all feature values in the index. */
public Saturation() {
this((Float) null);
}
public Saturation(float pivot) {
this(Float.valueOf(pivot));
}
private Saturation(Float pivot) {
this.pivot = pivot;
}
private Saturation(StreamInput in) throws IOException {
this(in.readOptionalFloat());
}
@Override
public boolean equals(Object obj) {
if (obj == null || obj.getClass() != getClass()) {
return false;
}
Saturation that = (Saturation) obj;
return Objects.equals(pivot, that.pivot);
}
@Override
public int hashCode() {
return Objects.hashCode(pivot);
}
@Override
void writeTo(StreamOutput out) throws IOException {
out.writeByte((byte) 1);
out.writeOptionalFloat(pivot);
}
@Override
void doXContent(XContentBuilder builder) throws IOException {
builder.startObject("saturation");
if (pivot != null) {
builder.field("pivot", pivot);
}
builder.endObject();
}
@Override
Query toQuery(String field, String feature, boolean positiveScoreImpact) throws IOException {
if (pivot == null) {
return FeatureField.newSaturationQuery(field, feature);
} else {
return FeatureField.newSaturationQuery(field, feature, DEFAULT_BOOST, pivot);
}
}
}
/**
* A scoring function that scores documents as {@code S^exp / (S^exp + pivot^exp)}
* where S is the value of the static feature.
*/
public static class Sigmoid extends ScoreFunction {
private static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
"sigmoid", a -> new Sigmoid((Float) a[0], ((Float) a[1]).floatValue()));
static {
PARSER.declareFloat(ConstructingObjectParser.constructorArg(), new ParseField("pivot"));
PARSER.declareFloat(ConstructingObjectParser.constructorArg(), new ParseField("exponent"));
}
private final float pivot;
private final float exp;
public Sigmoid(float pivot, float exp) {
this.pivot = pivot;
this.exp = exp;
}
private Sigmoid(StreamInput in) throws IOException {
this(in.readFloat(), in.readFloat());
}
@Override
public boolean equals(Object obj) {
if (obj == null || obj.getClass() != getClass()) {
return false;
}
Sigmoid that = (Sigmoid) obj;
return pivot == that.pivot
&& exp == that.exp;
}
@Override
public int hashCode() {
return Objects.hash(pivot, exp);
}
@Override
void writeTo(StreamOutput out) throws IOException {
out.writeByte((byte) 2);
out.writeFloat(pivot);
out.writeFloat(exp);
}
@Override
void doXContent(XContentBuilder builder) throws IOException {
builder.startObject("sigmoid");
builder.field("pivot", pivot);
builder.field("exponent", exp);
builder.endObject();
}
@Override
Query toQuery(String field, String feature, boolean positiveScoreImpact) throws IOException {
return FeatureField.newSigmoidQuery(field, feature, DEFAULT_BOOST, pivot, exp);
}
}
}
private static ScoreFunction readScoreFunction(StreamInput in) throws IOException {
byte b = in.readByte();
switch (b) {
case 0:
return new ScoreFunction.Log(in);
case 1:
return new ScoreFunction.Saturation(in);
case 2:
return new ScoreFunction.Sigmoid(in);
default:
throw new IOException("Illegal score function id: " + b);
}
}
public static ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
"feature", args -> {
final String field = (String) args[0];
final float boost = args[1] == null ? DEFAULT_BOOST : (Float) args[1];
final String queryName = (String) args[2];
long numNonNulls = Arrays.stream(args, 3, args.length).filter(Objects::nonNull).count();
final RankFeatureQueryBuilder query;
if (numNonNulls > 1) {
throw new IllegalArgumentException("Can only specify one of [log], [saturation] and [sigmoid]");
} else if (numNonNulls == 0) {
query = new RankFeatureQueryBuilder(field, new ScoreFunction.Saturation());
} else {
ScoreFunction scoreFunction = (ScoreFunction) Arrays.stream(args, 3, args.length)
.filter(Objects::nonNull)
.findAny()
.get();
query = new RankFeatureQueryBuilder(field, scoreFunction);
}
query.boost(boost);
query.queryName(queryName);
return query;
});
static {
PARSER.declareString(ConstructingObjectParser.constructorArg(), new ParseField("field"));
PARSER.declareFloat(ConstructingObjectParser.optionalConstructorArg(), BOOST_FIELD);
PARSER.declareString(ConstructingObjectParser.optionalConstructorArg(), NAME_FIELD);
PARSER.declareObject(ConstructingObjectParser.optionalConstructorArg(),
ScoreFunction.Log.PARSER, new ParseField("log"));
PARSER.declareObject(ConstructingObjectParser.optionalConstructorArg(),
ScoreFunction.Saturation.PARSER, new ParseField("saturation"));
PARSER.declareObject(ConstructingObjectParser.optionalConstructorArg(),
ScoreFunction.Sigmoid.PARSER, new ParseField("sigmoid"));
}
public static final String NAME = "rank_feature";
private final String field;
private final ScoreFunction scoreFunction;
/**
*
* @param field The field name.
* @param scoreFunction Scoring function for the rank_feature field.
*/
public RankFeatureQueryBuilder(String field, ScoreFunction scoreFunction) {
this.field = Objects.requireNonNull(field);
this.scoreFunction = Objects.requireNonNull(scoreFunction);
}
public RankFeatureQueryBuilder(StreamInput in) throws IOException {
super(in);
this.field = in.readString();
this.scoreFunction = readScoreFunction(in);
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeString(field);
scoreFunction.writeTo(out);
}
@Override
protected void doXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(getName());
builder.field("field", field);
scoreFunction.doXContent(builder);
printBoostAndQueryName(builder);
builder.endObject();
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
final MappedFieldType ft = context.fieldMapper(field);
if (ft instanceof RankFeatureFieldType) {
final RankFeatureFieldType fft = (RankFeatureFieldType) ft;
return scoreFunction.toQuery(RankFeatureMetaFieldMapper.NAME, field, fft.positiveScoreImpact());
} else if (ft == null) {
final int lastDotIndex = field.lastIndexOf('.');
if (lastDotIndex != -1) {
final String parentField = field.substring(0, lastDotIndex);
final MappedFieldType parentFt = context.fieldMapper(parentField);
if (parentFt instanceof RankFeaturesFieldType) {
return scoreFunction.toQuery(parentField, field.substring(lastDotIndex + 1), true);
}
}
return new MatchNoDocsQuery(); // unmapped field
} else {
throw new IllegalArgumentException("[rank_feature] query only works on [rank_feature] fields and " +
"features of [rank_features] fields, not [" + ft.typeName() + "]");
}
}
@Override
protected boolean doEquals(RankFeatureQueryBuilder other) {
return Objects.equals(field, other.field) && Objects.equals(scoreFunction, other.scoreFunction);
}
@Override
protected int doHashCode() {
return Objects.hash(field, scoreFunction);
}
}