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[Backport 2.x] Add support for approximate k-NN queries (#559)
* Add support for approximate k-NN queries (#548) * Add Knn query type Signed-off-by: Thomas Farr <[email protected]> * Integration test Signed-off-by: Thomas Farr <[email protected]> * Checkstyle fix Signed-off-by: Thomas Farr <[email protected]> * Run unreleased test Signed-off-by: Thomas Farr <[email protected]> * Fixes Signed-off-by: Thomas Farr <[email protected]> * Assume knn plugin installed Signed-off-by: Thomas Farr <[email protected]> * Changelog Signed-off-by: Thomas Farr <[email protected]> * Add to QueryBuilders Signed-off-by: Thomas Farr <[email protected]> --------- Signed-off-by: Thomas Farr <[email protected]> Signed-off-by: Thomas Farr <[email protected]> (cherry picked from commit f427f27) Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> * Fixing compile errors Signed-off-by: Vacha Shah <[email protected]> --------- Signed-off-by: Thomas Farr <[email protected]> Signed-off-by: Thomas Farr <[email protected]> Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Signed-off-by: Vacha Shah <[email protected]> Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Co-authored-by: Vacha Shah <[email protected]>
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202
java-client/src/main/java/org/opensearch/client/opensearch/_types/query_dsl/KnnQuery.java
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| @@ -0,0 +1,202 @@ | ||
| /* | ||
| * SPDX-License-Identifier: Apache-2.0 | ||
| * | ||
| * The OpenSearch Contributors require contributions made to | ||
| * this file be licensed under the Apache-2.0 license or a | ||
| * compatible open source license. | ||
| */ | ||
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| package org.opensearch.client.opensearch._types.query_dsl; | ||
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| import jakarta.json.stream.JsonGenerator; | ||
| import java.util.function.Function; | ||
| import javax.annotation.Nullable; | ||
| import org.opensearch.client.json.JsonpDeserializable; | ||
| import org.opensearch.client.json.JsonpDeserializer; | ||
| import org.opensearch.client.json.JsonpMapper; | ||
| import org.opensearch.client.json.ObjectBuilderDeserializer; | ||
| import org.opensearch.client.json.ObjectDeserializer; | ||
| import org.opensearch.client.util.ApiTypeHelper; | ||
| import org.opensearch.client.util.ObjectBuilder; | ||
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| @JsonpDeserializable | ||
| public class KnnQuery extends QueryBase implements QueryVariant { | ||
| private final String field; | ||
| private final float[] vector; | ||
| private final int k; | ||
| @Nullable | ||
| private final Query filter; | ||
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| private KnnQuery(Builder builder) { | ||
| super(builder); | ||
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| this.field = ApiTypeHelper.requireNonNull(builder.field, this, "field"); | ||
| this.vector = ApiTypeHelper.requireNonNull(builder.vector, this, "vector"); | ||
| this.k = ApiTypeHelper.requireNonNull(builder.k, this, "k"); | ||
| this.filter = builder.filter; | ||
| } | ||
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| public static KnnQuery of(Function<Builder, ObjectBuilder<KnnQuery>> fn) { | ||
| return fn.apply(new Builder()).build(); | ||
| } | ||
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| /** | ||
| * Query variant kind. | ||
| * @return The query variant kind. | ||
| */ | ||
| @Override | ||
| public Query.Kind _queryKind() { | ||
| return Query.Kind.Knn; | ||
| } | ||
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|
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| /** | ||
| * Required - The target field. | ||
| * @return The target field. | ||
| */ | ||
| public final String field() { | ||
| return this.field; | ||
| } | ||
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| /** | ||
| * Required - The vector to search for. | ||
| * @return The vector to search for. | ||
| */ | ||
| public final float[] vector() { | ||
| return this.vector; | ||
| } | ||
|
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| /** | ||
| * Required - The number of neighbors the search of each graph will return. | ||
| * @return The number of neighbors to return. | ||
| */ | ||
| public final int k() { | ||
| return this.k; | ||
| } | ||
|
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| /** | ||
| * Optional - A query to filter the results of the query. | ||
| * @return The filter query. | ||
| */ | ||
| @Nullable | ||
| public final Query filter() { | ||
| return this.filter; | ||
| } | ||
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| @Override | ||
| protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) { | ||
| generator.writeStartObject(this.field); | ||
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| super.serializeInternal(generator, mapper); | ||
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| // TODO: Implement the rest of the serialization. | ||
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| generator.writeKey("vector"); | ||
| generator.writeStartArray(); | ||
| for (float value : this.vector) { | ||
| generator.write(value); | ||
| } | ||
| generator.writeEnd(); | ||
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| generator.write("k", this.k); | ||
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| if (this.filter != null) { | ||
| generator.writeKey("filter"); | ||
| this.filter.serialize(generator, mapper); | ||
| } | ||
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| generator.writeEnd(); | ||
| } | ||
|
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| /** | ||
| * Builder for {@link KnnQuery}. | ||
| */ | ||
| public static class Builder extends QueryBase.AbstractBuilder<Builder> implements ObjectBuilder<KnnQuery> { | ||
| @Nullable | ||
| private String field; | ||
| @Nullable | ||
| private float[] vector; | ||
| @Nullable | ||
| private Integer k; | ||
| @Nullable | ||
| private Query filter; | ||
|
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| /** | ||
| * Required - The target field. | ||
| * @param field The target field. | ||
| * @return This builder. | ||
| */ | ||
| public Builder field(@Nullable String field) { | ||
| this.field = field; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * Required - The vector to search for. | ||
| * | ||
| * @param vector The vector to search for. | ||
| * @return This builder. | ||
| */ | ||
| public Builder vector(@Nullable float[] vector) { | ||
| this.vector = vector; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * Required - The number of neighbors the search of each graph will return. | ||
| * | ||
| * @param k The number of neighbors to return. | ||
| * @return This builder. | ||
| */ | ||
| public Builder k(@Nullable Integer k) { | ||
| this.k = k; | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * Optional - A query to filter the results of the knn query. | ||
| * | ||
| * @param filter The filter query. | ||
| * @return This builder. | ||
| */ | ||
| public Builder filter(@Nullable Query filter) { | ||
| this.filter = filter; | ||
| return this; | ||
| } | ||
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| @Override | ||
| protected Builder self() { | ||
| return this; | ||
| } | ||
|
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| /** | ||
| * Builds a {@link KnnQuery}. | ||
| * | ||
| * @return The built {@link KnnQuery}. | ||
| */ | ||
| @Override | ||
| public KnnQuery build() { | ||
| _checkSingleUse(); | ||
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| return new KnnQuery(this); | ||
| } | ||
| } | ||
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| public static final JsonpDeserializer<KnnQuery> _DESERIALIZER = ObjectBuilderDeserializer | ||
| .lazy(Builder::new, KnnQuery::setupKnnQueryDeserializer); | ||
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| protected static void setupKnnQueryDeserializer(ObjectDeserializer<Builder> op) { | ||
| setupQueryBaseDeserializer(op); | ||
| op.add((b, v) -> { | ||
| float[] vector = new float[v.size()]; | ||
| int i = 0; | ||
| for (Float value : v) { | ||
| vector[i++] = value; | ||
| } | ||
| b.vector(vector); | ||
| }, JsonpDeserializer.arrayDeserializer(JsonpDeserializer.floatDeserializer()), "vector"); | ||
| op.add(Builder::k, JsonpDeserializer.integerDeserializer(), "k"); | ||
| op.add(Builder::filter, Query._DESERIALIZER, "filter"); | ||
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| op.setKey(Builder::field, JsonpDeserializer.stringDeserializer()); | ||
| } | ||
| } |
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