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Approximate match all with sort with a bounded range query
If we run a match-all query and sort results by a numeric/timestamp field, then we can replace the match-all with a filter over the top/bottom 10,000 (or whatever `track_total_hits` is set to) values from the sort field. Signed-off-by: Michael Froh <froh@amazon.com>
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server/src/main/java/org/opensearch/search/approximate/ApproximateMatchAllQuery.java
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| /* | ||
| * 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.search.approximate; | ||
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| import org.apache.lucene.search.IndexSearcher; | ||
| import org.apache.lucene.search.Query; | ||
| import org.apache.lucene.search.QueryVisitor; | ||
| import org.opensearch.index.mapper.MappedFieldType; | ||
| import org.opensearch.search.internal.SearchContext; | ||
| import org.opensearch.search.sort.FieldSortBuilder; | ||
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| import java.io.IOException; | ||
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| /** | ||
| * Replaces match-all query with a less expensive query if possible. | ||
| * <p> | ||
| * Currently, will rewrite to a bounded range query over the high/low end of a field if a primary sort is specified | ||
| * on that field. | ||
| */ | ||
| public class ApproximateMatchAllQuery extends ApproximateQuery { | ||
| private ApproximateQuery approximation = null; | ||
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| @Override | ||
| protected boolean canApproximate(SearchContext context) { | ||
| if (context == null) { | ||
| return false; | ||
| } | ||
| if (context.aggregations() != null) { | ||
| return false; | ||
| } | ||
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| if (context.request() != null && context.request().source() != null) { | ||
| FieldSortBuilder primarySortField = FieldSortBuilder.getPrimaryFieldSortOrNull(context.request().source()); | ||
| if (primarySortField != null && primarySortField.missing() == null) { | ||
| MappedFieldType mappedFieldType = context.getQueryShardContext().fieldMapper(primarySortField.fieldName()); | ||
| Query rangeQuery = mappedFieldType.rangeQuery(null, null, false, false, null, null, null, context.getQueryShardContext()); | ||
| if (rangeQuery instanceof ApproximateScoreQuery) { | ||
| ApproximateScoreQuery approximateScoreQuery = (ApproximateScoreQuery) rangeQuery; | ||
| approximateScoreQuery.setContext(context); | ||
| if (approximateScoreQuery.resolvedQuery instanceof ApproximateQuery) { | ||
| approximation = (ApproximateQuery) approximateScoreQuery.resolvedQuery; | ||
| return true; | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
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| @Override | ||
| public String toString(String field) { | ||
| return "Approximate(*:*)"; | ||
| } | ||
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| @Override | ||
| public void visit(QueryVisitor visitor) { | ||
| visitor.visitLeaf(this); | ||
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| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| return sameClassAs(o); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return classHash(); | ||
| } | ||
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| @Override | ||
| public Query rewrite(IndexSearcher indexSearcher) throws IOException { | ||
| if (approximation == null) { | ||
| throw new IllegalStateException("rewrite called without setting context or query could not be approximated"); | ||
| } | ||
| return approximation; | ||
| } | ||
| } |
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