[GitHub] [lucene] gsmiller commented on a diff in pull request #12089: [DRAFT] Explore TermInSet Query that "self optimizes"

[GitBox <gi...@apache.org>]

gsmiller commented on code in PR #12089:
URL: https://github.com/apache/lucene/pull/12089#discussion_r1072835306


##########
lucene/sandbox/src/java/org/apache/lucene/sandbox/queries/TermInSetQuery.java:
##########
@@ -0,0 +1,527 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.apache.lucene.sandbox.queries;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.lucene.index.DocValues;
+import org.apache.lucene.index.DocValuesType;
+import org.apache.lucene.index.FieldInfo;
+import org.apache.lucene.index.LeafReader;
+import org.apache.lucene.index.LeafReaderContext;
+import org.apache.lucene.index.PostingsEnum;
+import org.apache.lucene.index.SortedDocValues;
+import org.apache.lucene.index.SortedSetDocValues;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.index.TermState;
+import org.apache.lucene.index.Terms;
+import org.apache.lucene.index.TermsEnum;
+import org.apache.lucene.search.ConstantScoreScorer;
+import org.apache.lucene.search.ConstantScoreWeight;
+import org.apache.lucene.search.DisiPriorityQueue;
+import org.apache.lucene.search.DisiWrapper;
+import org.apache.lucene.search.DocIdSetIterator;
+import org.apache.lucene.search.IndexSearcher;
+import org.apache.lucene.search.MatchNoDocsQuery;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.QueryVisitor;
+import org.apache.lucene.search.ScoreMode;
+import org.apache.lucene.search.Scorer;
+import org.apache.lucene.search.ScorerSupplier;
+import org.apache.lucene.search.TermQuery;
+import org.apache.lucene.search.TwoPhaseIterator;
+import org.apache.lucene.search.Weight;
+import org.apache.lucene.util.BytesRef;
+import org.apache.lucene.util.DocIdSetBuilder;
+import org.apache.lucene.util.LongBitSet;
+import org.apache.lucene.util.PriorityQueue;
+
+public class TermInSetQuery extends Query {
+  // TODO: tunable coefficients. need to actually tune them (or maybe these are too complex and not
+  // useful)
+  private static final double J = 1.0;
+  private static final double K = 1.0;
+  // L: postings lists under this threshold will always be "pre-processed" into a bitset
+  private static final int L = 512;
+  // M: max number of clauses we'll manage/check during scoring (these remain "unprocessed")
+  private static final int M = Math.min(IndexSearcher.getMaxClauseCount(), 64);
+
+  private final String field;
+  // TODO: Not particularly memory-efficient; could use prefix-coding here but sorting isn't free
+  private final BytesRef[] terms;

Review Comment:
   I generally agree. I was testing some interesting use-cases though with our current `TermInSetQuery` where we have 10,000+ terms (PK-type field), and the sorting it does actually came with a significant cost (and we got a pretty good win by removing it). But that's a bit of a different use-case maybe now that I think about it. We have a bloom filter in place as well, and a good share of the terms aren't actually in the index. So there's that...
   
   OK, yeah, we probably ought to sort here in a general implementation :)



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