Issue 4 of Volume 14 of the Proceedings of the VLDB Endowment (PVLDB) is now available electronically at the VLDB website:

   http://www.vldb.org/pvldb/vol14.html

This issue consists of the following papers that have been accepted for the research track of VLDB 2021 in Copenhagen, Denmark in December 2020:

- Space- and Computationally-Efficient Set Reconciliation via Parity Bitmap Sketch (PBS)
Long Gong, Ziheng Liu, Liang Liu, Jun Xu, Mitsunori Ogihara, Tong Yang
http://www.vldb.org/pvldb/vol14/p458-gong.pdf

- Astrid: Accurate Selectivity Estimation for String Predicates using Deep Learning
Suraj Shetiya, Saravanan Thirumuruganathan, Nick Koudas, Gautam Das
http://www.vldb.org/pvldb/vol14/p471-shetiya.pdf

- Compact, Tamper-Resistant Archival of Fine-Grained Provenance
Nan Zheng, Zack Ives
http://www.vldb.org/pvldb/vol14/p485-zheng.pdf

- Rumble: Data Independence for Large Messy Data Sets
Ingo Müller, Ghislain Fourny, Stefan Irimescu, Can Cikis, Gustavo Alonso
http://www.vldb.org/pvldb/vol14/p498-müller.pdf

- Capturing and querying fine-grained provenance of preprocessing pipelines in data science
Adriane Chapman, Paolo Missier, Giulia Simonelli, Riccardo Torlone
http://www.vldb.org/pvldb/vol14/p507-chapman.pdf

- Local Dampening: Differential Privacy for Non-numeric Queries via Local Sensitivity
Victor Farias, Felipe Brito, Cheryl Flynn, Javam Machado, Subhabrata Majumdar, Divesh Srivastava
http://www.vldb.org/pvldb/vol14/p521-farias.pdf

- Mainlining Databases: Supporting Fast Transactional Workloads on Universal Columnar Data File Formats
Tianyu Li, Matthew Butrovich, Amadou Ngom, Wan Shen Lim, Wes Mckinney, Andrew Pavlo
http://www.vldb.org/pvldb/vol14/p534-li.pdf

- Accelerating Exact Constrained Shortest Paths on GPUs
Shengliang Lu, Bingsheng He, Yuchen Li, Hao Fu
http://www.vldb.org/pvldb/vol14/p547-lu.pdf

- Towards an Efficient Weighted Random Walk Domination
Songsong Mo, Zhifeng Bao, Ping Zhang, Zhiyong Peng
http://www.vldb.org/pvldb/vol14/p560-mo.pdf

- Scalable Mining of Maximal Quasi-Cliques: An Algorithm-System Codesign Approach
Guimu Guo, Da Yan, Tamer Özsu, Zhe Jiang, Jalal Khalil
http://www.vldb.org/pvldb/vol14/p573-guo.pdf

- CALYPSO: Private Data Management for Decentralized Ledgers
Eleftherios Kokoris Kogias, Enis Ceyhun Alp, Linus Gasser, Philipp Jovanovic, Ewa Syta, Bryan Ford
http://www.vldb.org/pvldb/vol14/p586-kogias.pdf

- Stacked Filters: Learning to Filter by Structure
Brian Hentschel, Stratos Idreos, Kyle Deeds
http://www.vldb.org/pvldb/vol14/p600-hentschel.pdf

- Maximizing Social Welfare in a Competitive Diffusion Model
Prithu Banerjee, Laks V.s. Lakshmanan, Wei Chen
http://www.vldb.org/pvldb/vol14/p613-banerjee.pdf

- Understanding the Idiosyncrasies of Real Persistent Memory
Shashank Gugnani, Arjun Kashyap, Xiaoyi Lu
http://www.vldb.org/pvldb/vol14/p626-gugnani.pdf

- Explaining Ranking Functions
Amelie Marian, Abraham Gale
http://www.vldb.org/pvldb/vol14/p640-marian.pdf

- ConnectIt: A Framework for Static and Incremental Parallel Graph Connectivity Algorithms
Laxman Dhulipala, Changwan Hong, Julian Shun
http://www.vldb.org/pvldb/vol14/p653-dhulipala.pdf

- Quality of Sentiment Analysis Tools: The Reasons of Inconsistency
Wissam Mammar Kouadri, Mourad Ouziri, Salima Benbernou, Karima Echihabi, Themis Palpanas, Iheb Benamor
http://www.vldb.org/pvldb/vol14/p668-kouadri.pdf

- Hindsight Logging for Model Training
Rolando Garcia, Erick Liu, Vikram Sreekanti, Bobby Yan, Anusha Dandamudi, Joseph Gonzalez, Joseph Hellerstein, Koushik Sen
http://www.vldb.org/pvldb/vol14/p682-garcia.pdf

- Scalable Structural Index Construction for JSON Analytics
Zhijia Zhao, Lin Jiang
http://www.vldb.org/pvldb/vol14/p694-zhao.pdf

- Efficient Join Algorithms For Large Database Tables in a Multi-GPU Environment
Ran Rui, Hao Li, Yi-Cheng Tu
http://www.vldb.org/pvldb/vol14/p708-rui.pdf

Best regards,

Thorsten Papenbrock, HPI, Germany
Hannes Muehleisen, CWI, The Netherlands
VLDB 2021 Proceedings Chairs