| Vol-2572 urn:nbn:de:0074-2572-0 Copyright © 2020 for the individual papers by the papers' authors. Copyright © 2020 for the volume as a collection by its editors. This volume and its papers are published under the Creative Commons License Attribution 4.0 International (CC BY 4.0).

# DOLAP 2020
Design, Optimization, Languages and Analytical Processing of Big Data

### Proceedings of the 22nd International Workshop on Design, Optimization, Languages and Analytical Processing of Big Data
co-located with EDBT/ICDT 2020 Joint Conference (EDBT/ICDT 2020)

### Copenhagen, Denmark, March 30, 2020.

Edited by

### Il-Yeol Song *
Katja Hose **
Oscar Romero ***

* Drexel University, Philadelphia, USA
** Aalborg University, Aalborg, Denmark
*** Universitat Politècnica de Catalunya - BarcelonaTech, Barcelona, Spain

## Table of Contents

- Preface
  Katja Hose, Oscar Romero, Il-Yeol Song

### Invited Talk

- Exploring RDF Graphs through Summarization and Analytic Query Discovery 1-5
  Ioana Manolescu

### Regular Papers

- Towards Conversational OLAP 6-15
  Matteo Francia, Enrico Gallinucci, Matteo Golfarelli
- Query-Centric Regression for In-DBMS Analytics 16-25
  Qingzhi Ma, Peter Triantafillou
- KD-means: Clustering Method for Massive Data based on KD-tree 26-35
  Nabil El Malki, Franck Ravat, Olivier Teste
- Hierarchical Property Set Merging for SPARQL Query Optimization 36-45
  Marios Meimaris, George Papastefanatos, Panos Vassiliadis
- Learning Analysis Patterns using a Contextual Edit Distance 46-55
  Clément Moreau, Verónika Peralta, Patrick Marcel, Alexandre Chanson, Thomas Devogele
- Query Optimization for Large Scale Clustered RDF Data 56-65
  Ishaq Zouaghi, Amin Mesmoudi, Jorge Galicia, Ladjel Bellatreche, Taoufik Aguili
- To Each His Own: Accommodating Data Variety by a Multimodel Star Schema 66-73
  Sandro Bimonte, Yassine Hifdi, Mohammed Maliari, Patrick Marcel, Stefano Rizzi

### Short Papers

- On Evaluating Performance of Balanced Optimization of ETL Processes for Streaming Data Sources 74-78
  Michal Bodziony, Szymon Roszyk, Robert Wrembel
- Large Scale Querying and Processing for Property Graphs 79-83
  Mohamed Ragab
- An Approach to Automatically Detect and Visualize Bias in Data Analytics 84-88
  Ana Lavalle, Alejandro Maté, Juan Trujillo
- Position Caching in a Column-Store with Late Materialization: An Initial Study 89-93
  Viacheslav Galaktionov, Evgeniy Klyuchikov, George Chernishev
- The Traveling Analyst Problem: Definition and Preliminary Study 94-98
  Alexandre Chanson, Ben Crulis, Nicolas Labroche, Patrick Marcel, Verónika Peralta, Stefano Rizzi, Panos Vassiliadis

2020-03-11: submitted by Oscar Romero, metadata incl. bibliographic data published under Creative Commons CC0
2020-03-13: published on CEUR Workshop Proceedings (CEUR-WS.org, ISSN 1613-0073) |valid HTML5|