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Allow field types to optimize phrase prefix queries (elastic#37436)
This change adds a way to customize how phrase prefix queries should be created on field types. The match phrase prefix query is exposed in field types in order to allow optimizations based on the options set on the field. For instance the text field uses the configured prefix field (if available) to build a span near that mixes the original field and the prefix field on the last position. This change also contains a small refactoring of the match/multi_match query that simplifies the interactions between the builders. Closes elastic#31921
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119 changes: 119 additions & 0 deletions
119
...ain/java/org/elasticsearch/common/lucene/search/SpanBooleanQueryRewriteWithMaxClause.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,119 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.elasticsearch.common.lucene.search; | ||
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| import org.apache.lucene.index.IndexReader; | ||
| import org.apache.lucene.index.IndexReaderContext; | ||
| import org.apache.lucene.index.LeafReaderContext; | ||
| import org.apache.lucene.index.Term; | ||
| import org.apache.lucene.index.Terms; | ||
| import org.apache.lucene.index.TermsEnum; | ||
| import org.apache.lucene.queries.SpanMatchNoDocsQuery; | ||
| import org.apache.lucene.search.BooleanQuery; | ||
| import org.apache.lucene.search.MultiTermQuery; | ||
| import org.apache.lucene.search.Query; | ||
| import org.apache.lucene.search.spans.SpanMultiTermQueryWrapper; | ||
| import org.apache.lucene.search.spans.SpanOrQuery; | ||
| import org.apache.lucene.search.spans.SpanQuery; | ||
| import org.apache.lucene.search.spans.SpanTermQuery; | ||
| import org.apache.lucene.util.BytesRef; | ||
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|
||
| import java.io.IOException; | ||
| import java.util.Collection; | ||
| import java.util.HashSet; | ||
| import java.util.Set; | ||
|
|
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| /** | ||
| * A span rewrite method that extracts the first <code>maxExpansions</code> terms | ||
| * that match the {@link MultiTermQuery} in the terms dictionary. | ||
| * The rewrite throws an error if more than <code>maxExpansions</code> terms are found and <code>hardLimit</code> | ||
| * is set. | ||
| */ | ||
| public class SpanBooleanQueryRewriteWithMaxClause extends SpanMultiTermQueryWrapper.SpanRewriteMethod { | ||
| private final int maxExpansions; | ||
| private final boolean hardLimit; | ||
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| public SpanBooleanQueryRewriteWithMaxClause() { | ||
| this(BooleanQuery.getMaxClauseCount(), true); | ||
| } | ||
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| public SpanBooleanQueryRewriteWithMaxClause(int maxExpansions, boolean hardLimit) { | ||
| this.maxExpansions = maxExpansions; | ||
| this.hardLimit = hardLimit; | ||
| } | ||
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| public int getMaxExpansions() { | ||
| return maxExpansions; | ||
| } | ||
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| public boolean isHardLimit() { | ||
| return hardLimit; | ||
| } | ||
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| @Override | ||
| public SpanQuery rewrite(IndexReader reader, MultiTermQuery query) throws IOException { | ||
| final MultiTermQuery.RewriteMethod delegate = new MultiTermQuery.RewriteMethod() { | ||
| @Override | ||
| public Query rewrite(IndexReader reader, MultiTermQuery query) throws IOException { | ||
| Collection<SpanQuery> queries = collectTerms(reader, query); | ||
| if (queries.size() == 0) { | ||
| return new SpanMatchNoDocsQuery(query.getField(), "no expansion found for " + query.toString()); | ||
| } else if (queries.size() == 1) { | ||
| return queries.iterator().next(); | ||
| } else { | ||
| return new SpanOrQuery(queries.toArray(new SpanQuery[0])); | ||
| } | ||
| } | ||
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| private Collection<SpanQuery> collectTerms(IndexReader reader, MultiTermQuery query) throws IOException { | ||
| Set<SpanQuery> queries = new HashSet<>(); | ||
| IndexReaderContext topReaderContext = reader.getContext(); | ||
| for (LeafReaderContext context : topReaderContext.leaves()) { | ||
| final Terms terms = context.reader().terms(query.getField()); | ||
| if (terms == null) { | ||
| // field does not exist | ||
| continue; | ||
| } | ||
|
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| final TermsEnum termsEnum = getTermsEnum(query, terms, null); | ||
| assert termsEnum != null; | ||
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| if (termsEnum == TermsEnum.EMPTY) | ||
| continue; | ||
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| BytesRef bytes; | ||
| while ((bytes = termsEnum.next()) != null) { | ||
| if (queries.size() >= maxExpansions) { | ||
| if (hardLimit) { | ||
| throw new RuntimeException("[" + query.toString() + " ] " + | ||
| "exceeds maxClauseCount [ Boolean maxClauseCount is set to " + BooleanQuery.getMaxClauseCount() + "]"); | ||
| } else { | ||
| return queries; | ||
| } | ||
| } | ||
| queries.add(new SpanTermQuery(new Term(query.getField(), bytes))); | ||
| } | ||
| } | ||
| return queries; | ||
| } | ||
| }; | ||
| return (SpanQuery) delegate.rewrite(reader, query); | ||
| } | ||
| } |
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