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Extending Q-Grams to Estimate Selectivity of String Matching with Low Edit Distance

Summary: Extends q-grams with wildcards to estimate selectivity for approximate string matching. Proposes replacement semi-lattice and string hierarchy; presents BasicEQ and two improvements to OptEQ; experiments on three benchmarks show OptEQ outperforms SEPIA. (summarized by gpt-5-nano on Feb 09 2026)

Paper ID
9575
Venue
VLDB
Year
2007
Pagerank
7.3433307e-05
Overall Rank
3,226 | 77.56%
DOI
-

Incoming Non-self Citations Over Time

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Incoming Citations (Sorted by Pagerank)

Showing 15 of 15 citing papers.

Rank Citing Paper Year Venue Pagerank
1,234 Ed-Join: An Efficient Algorithm for Similarity Joins With Edit Distance Constraints 2008 VLDB 0.00013122499
2,193 Cost-Based Variable-Length-Gram Selection for String Collections to Support Approximate Queries Efficiently 2008 SIGMOD 9.3178557e-05
2,592 Pass-Join: A Partition-based Method for Similarity Joins 2012 VLDB 8.4795761e-05
2,779 Hashed Samples: Selectivity Estimators For Set Similarity Selection Queries 2008 VLDB 8.1320575e-05
3,578 Efficient Approximate Entity Extraction with Edit Distance Constraints 2009 SIGMOD 6.9503858e-05
4,359 Astrid: Accurate Selectivity Estimation for String Predicates using Deep Learning 2021 VLDB 6.2569955e-05
4,873 Power-Law Based Estimation of Set Similarity Join Size 2009 VLDB 5.8602304e-05
4,901 Probabilistic String Similarity Joins 2010 SIGMOD 5.8411648e-05
5,073 Faerie: Efficient Filtering Algorithms for Approximate Dictionary-based Entity Extraction 2011 SIGMOD 5.7177424e-05
5,887 Efficient Approximate Search on String Collections (Tutorial) 2009 VLDB 5.2879769e-05
7,186 LPLM: A Neural Language Model for Cardinality Estimation of LIKE-Queries 2024 SIGMOD 4.8063731e-05
7,474 Cardinality Estimation of Approximate Substring Queries using Deep Learning 2022 VLDB 4.7194345e-05
7,708 Efficient Top-k Algorithms for Approximate Substring Matching 2013 SIGMOD 4.6721808e-05
9,726 Cardinality Estimation of LIKE Predicate Queries using Deep Learning 2025 SIGMOD 4.2943379e-05
9,945 SSCard: Substring Cardinality Estimation using Suffix Tree-Guided Learned FM-Index 2026 SIGMOD 4.2432653e-05
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Outgoing Citations (Sorted by Pagerank)

Showing 9 of 9 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

Rank Cited Paper Year Venue Pagerank
36 Fast Algorithms for Mining Association Rules 1994 VLDB 0.00076161096
125 Approximate String Joins in a Database (Almost) for Free 2001 VLDB 0.00044847972
155 Robust and Efficient Fuzzy Match for Online Data Cleaning 2003 SIGMOD 0.00040637896
1,046 Estimating the Selectivity of XML Path Expressions for Internet Scale Applications 2001 VLDB 0.00014462307
1,146 Estimating Alphanumeric Selectivity in the Presence of Wildcards 1996 SIGMOD 0.00013679782
1,379 Substring Selectivity Estimation 1999 PODS 0.00012286879
4,438 Selectivity Estimation for Fuzzy String Predicates in Large Data Sets 2005 VLDB 6.1898903e-05
4,660 XPathLearner: An On-Line Self-Tuning Markov Histogram for XML Path Selectivity Estimation 2002 VLDB 6.014625e-05
7,777 Indexing Mixed Types for Approximate Retrieval 2005 VLDB 4.653704e-05
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Overall Rank Paper Year Venue Pagerank
2,171 Selectivity Estimation For Boolean Queries 2000 PODS 9.3807165e-05
1,202 VGRAM: Improving Performance of Approximate Queries on String Collections Using Variable-Length Grams 2007 VLDB 0.00013326298
3,774 Efficient Exact Edit Similarity Query Processing with the Asymmetric Signature Scheme 2011 SIGMOD 6.7757301e-05
3,035 Multi-Dimensional Substring Selectivity Estimation 1999 VLDB 7.6748073e-05
1,234 Ed-Join: An Efficient Algorithm for Similarity Joins With Edit Distance Constraints 2008 VLDB 0.00013122499
2,193 Cost-Based Variable-Length-Gram Selection for String Collections to Support Approximate Queries Efficiently 2008 SIGMOD 9.3178557e-05
125 Approximate String Joins in a Database (Almost) for Free 2001 VLDB 0.00044847972
1,379 Substring Selectivity Estimation 1999 PODS 0.00012286879
4,438 Selectivity Estimation for Fuzzy String Predicates in Large Data Sets 2005 VLDB 6.1898903e-05
7,708 Efficient Top-k Algorithms for Approximate Substring Matching 2013 SIGMOD 4.6721808e-05