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[Backport] Added files for implementing index_prefix (#823)
Added files for implementing index_prefix
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64 changes: 64 additions & 0 deletions
64
src/main/java/com/yelp/nrtsearch/server/luceneserver/analysis/PrefixWrappedAnalyzer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /* | ||
| * Copyright 2025 Yelp Inc. | ||
| * | ||
| * Licensed 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 com.yelp.nrtsearch.server.luceneserver.analysis; | ||
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|
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| import org.apache.lucene.analysis.Analyzer; | ||
| import org.apache.lucene.analysis.AnalyzerWrapper; | ||
| import org.apache.lucene.analysis.TokenFilter; | ||
| import org.apache.lucene.analysis.ngram.EdgeNGramTokenFilter; | ||
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|
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| /** | ||
| * An {@link AnalyzerWrapper} that wraps another analyzer and applies an Edge N-Gram token filter to | ||
| * the token stream. | ||
| */ | ||
| public class PrefixWrappedAnalyzer extends AnalyzerWrapper { | ||
| private final int minChars; | ||
| private final int maxChars; | ||
| private final Analyzer delegate; | ||
|
|
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| /** | ||
| * Create a new {@link PrefixWrappedAnalyzer} that wraps the given {@link Analyzer} and sets | ||
| * applies an Edge N-Gram token filter to the token stream. | ||
| * | ||
| * @param delegate the analyzer to wrap | ||
| * @param minChars the minimum number of characters for the edge n-grams | ||
| * @param maxChars the maximum number of characters for the edge n-grams | ||
| */ | ||
| public PrefixWrappedAnalyzer(Analyzer delegate, int minChars, int maxChars) { | ||
| super(delegate.getReuseStrategy()); | ||
| this.delegate = delegate; | ||
| this.minChars = minChars; | ||
| this.maxChars = maxChars; | ||
| } | ||
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| @Override | ||
| protected Analyzer getWrappedAnalyzer(String fieldName) { | ||
| return delegate; | ||
| } | ||
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| @Override | ||
| protected TokenStreamComponents wrapComponents( | ||
| String fieldName, TokenStreamComponents components) { | ||
| TokenFilter filter = | ||
| new EdgeNGramTokenFilter(components.getTokenStream(), minChars, maxChars, false); | ||
| return new TokenStreamComponents(components.getSource(), filter); | ||
| } | ||
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|
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| @Override | ||
| public String toString() { | ||
| return "PrefixWrappedAnalyzer(" + delegate.toString() + ")"; | ||
| } | ||
| } |
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105 changes: 105 additions & 0 deletions
105
src/main/java/com/yelp/nrtsearch/server/luceneserver/field/PrefixFieldDef.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| /* | ||
| * Copyright 2025 Yelp Inc. | ||
| * | ||
| * Licensed 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 com.yelp.nrtsearch.server.luceneserver.field; | ||
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|
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| import com.yelp.nrtsearch.server.grpc.Field; | ||
| import com.yelp.nrtsearch.server.grpc.PrefixQuery; | ||
| import com.yelp.nrtsearch.server.luceneserver.analysis.PrefixWrappedAnalyzer; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import org.apache.lucene.analysis.Analyzer; | ||
| import org.apache.lucene.document.FieldType; | ||
| import org.apache.lucene.index.IndexOptions; | ||
| import org.apache.lucene.index.Term; | ||
| import org.apache.lucene.search.*; | ||
| import org.apache.lucene.util.automaton.Automata; | ||
| import org.apache.lucene.util.automaton.Automaton; | ||
| import org.apache.lucene.util.automaton.Operations; | ||
|
|
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| public class PrefixFieldDef extends TextBaseFieldDef { | ||
| private final int minChars; | ||
| private final int maxChars; | ||
| private final String parentField; | ||
| private static final String INDEX_PREFIX = "._index_prefix"; | ||
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| public PrefixFieldDef(String parentName, Field requestField) { | ||
| super(parentName + INDEX_PREFIX, requestField); | ||
| this.minChars = requestField.getIndexPrefixes().getMinChars(); | ||
| this.maxChars = requestField.getIndexPrefixes().getMaxChars(); | ||
| this.parentField = parentName; | ||
| } | ||
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| @Override | ||
| protected void setSearchProperties(FieldType fieldType, Field requestField) { | ||
| fieldType.setOmitNorms(true); | ||
| fieldType.setTokenized(true); | ||
| fieldType.setIndexOptions(IndexOptions.DOCS); | ||
| } | ||
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| @Override | ||
| protected Analyzer parseIndexAnalyzer(Field requestField) { | ||
| Analyzer baseAnalyzer = super.parseIndexAnalyzer(requestField); | ||
| if (baseAnalyzer == null) { | ||
| throw new IllegalArgumentException("Could not determine analyzer"); | ||
| } | ||
| return new PrefixWrappedAnalyzer( | ||
| baseAnalyzer, | ||
| requestField.getIndexPrefixes().getMinChars(), | ||
| requestField.getIndexPrefixes().getMaxChars()); | ||
| } | ||
|
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| boolean accept(int length) { | ||
| return length >= minChars - 1 && length <= maxChars; | ||
| } | ||
|
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| public Query getPrefixQuery(PrefixQuery prefixQuery, MultiTermQuery.RewriteMethod rewriteMethod) { | ||
| String textValue = prefixQuery.getPrefix(); | ||
| if (textValue.length() >= minChars) { | ||
| return super.getTermQueryFromTextValue(textValue); | ||
| } | ||
| List<Automaton> automata = new ArrayList<>(); | ||
| automata.add(Automata.makeString(textValue)); | ||
| for (int i = textValue.length(); i < minChars; i++) { | ||
| automata.add(Automata.makeAnyChar()); | ||
| } | ||
| Automaton automaton = Operations.concatenate(automata); | ||
| AutomatonQuery query = new AutomatonQuery(new Term(getName(), textValue + "*"), automaton); | ||
| query.setRewriteMethod(rewriteMethod); | ||
| return new BooleanQuery.Builder() | ||
| .add(query, BooleanClause.Occur.SHOULD) | ||
| .add(new TermQuery(new Term(parentField, textValue)), BooleanClause.Occur.SHOULD) | ||
| .build(); | ||
| } | ||
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| @Override | ||
| public String getType() { | ||
| return "PREFIX"; | ||
| } | ||
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| public int getMinChars() { | ||
| return minChars; | ||
| } | ||
|
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| public int getMaxChars() { | ||
| return maxChars; | ||
| } | ||
|
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(super.hashCode(), minChars, maxChars, parentField); | ||
| } | ||
| } |
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