HDMS 2026 - Program Overview

Program

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Conference Language:

Day 1: Mostly in Greek (except for the Keynote).
Day 2: Exclusively in English.

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Posters & Demos:

All posters and demos that have a lightning talk on a specific day will be presented during the corresponding poster/demo session of the same day.

Day 1 - July 2nd, 2026Language: Greek (Mainly)

Time	Session Details
09:00 - 09:30	Opening Session
09:30 - 10:30	Keynote I Self-designing AI Stratos Idreos (Harvard University)
10:30 - 11:00	Coffee Break - sponsored by COSMOTE TELEKOM
11:00 - 12:00	Talks I (Click to expand details) (5 papers @ 10+2min each) Session Papers: EmeraldMind: A Knowledge Graph–Augmented Framework for Greenwashing Detection Georgios Kaoukis, Ioannis-Aris Koufopoulos, Eleni Psaroudaki, Danae Pla Karidi, Evaggelia Pitoura, George Papastefanatos, Panayiotis Tsaparas The UDFBench Benchmark for General-purpose UDF Queries Yannis Foufoulas, Theoni Palaiologou, Alkis Simitsis Embedding-Based SQL Query Similarity for Spatiotemporal Data Exploration Evangelos Karageorgos, Alexandros Labrinidis Love-at-First-Sight: First Answers Without the Awkward Silence in Big Knowledge Graphs Giannis Vassiliou, Haridimos Kondylakis PG-HIVE: Hybrid Incremental Schema Discovery for Property Graphs Sophia Sideri, Georgia Troullinou, Elisjana Ymeralli, Vasilis Efthymiou, Dimitris Plexousakis, Haridimos Kondylakis
12:00 - 12:30	Lightning Talks I (Click to expand details) (13 papers @ 2min each) Session Papers: Multisided Fairness under Limited Item Availability in Recommender Systems Reza Shafiloo, Maria Stratigi, Jaakko Peltonen, Kostas Stefanidis WETW: Efficient DTW Approximation over DTW-Aware Embeddings Christos Panourgias, Qitong Wang, Themis Palpanas APEROL: Adaptive Parallel Edge-to-Cloud Runtime Optimization for Layered Workflow Execution Dimitrios Banelas, Alkis Simitsis, Nikos Giatrakos Optimizing UDF Queries in SQL Data Engines Kostantinos Chasialis, Yannis Foufoulas, Alkis Simitsis, Yannis Ioannidis Skyline-based Exploration of Temporal Property Graphs Evangelia Tsoukanara, Georgia Koloniari, Evaggelia Pitoura FlowLog: Efficient and Extensible Datalog via Incrementality Paraschos Koutris FACEGroup: Feasible and Actionable Counterfactual Explanations for Group Fairness Christos Fragkathoulas, Vasiliki Papanikou, Evaggelia Pitoura, Evimaria Terzi Comparison and Analysis of Value Linking in Text-to-SQL Systems [Experiments & Analysis] Apostolos Koukouvinis, George Katsogiannis-Meimarakis, Georgia Koutrika Analytics Modelling over Evolving Multi-Domain Datasets Using Vector Embeddings and Vector Database Andreas Loizou, Dimitrios Tsoumakos LLM-Enhanced DETEXA Workflow Builder for Semantic Enrichment Demo Yannis Foufoulas, Eleni Zacharia, Harry Dimitropoulos, Natalia Manola, Yannis Ioannidis HazardEvac: An Evacuation Route Planning Platform with Hazard Simulation Demo Pantelis Kanaris, Demetris Zeinalipour NeuroFlinkCEP: Neurosymbolic Complex Event Recognition Optimized across IoT Platforms Demo Ourania Ntouni, Dimitrios Banelas, Nikos Giatrakos Deploying the Medical Informatics Platform for cross-border federated analytics in FERES and eCREAM Demo Georges Melissargos, Birgit Schaffhauser, Evdokia Mailli, Pauline Ducouret, Guido Bertolini, Patrik Michel, Maria Alexandra Rujano, Giulia Irene Ghilardi, Alexander Salerno, Viktoria Bastic, Julien Dhallenne, Kostas Filippopolitis, Maria-Olympia Katsouli, Thanasis-Michail Karampatsis, Yannis Ioannidis, Philippe Ryvlin, Apostolos Glenis
12:30 - 13:30	Lunch
13:30 - 14:30	Poster + Demo Session
14:30 - 16:00	Talks II (Click to expand details) (7 papers @ 10+2min each) Session Papers: A-Scan: Efficient Scale-up Analytics via Throughput-Guided Data Movement Hamish Nicholson, Aunn Raza, Viktor Sanca, Anastasia Ailamaki RABIT: Efficient Range Queries with Bitmap Indexing Junchang Wang, Fu Xiao, Manos Athanassoulis DimWeaver: Dimensional Weaved Trajectory Compression Xenophon Kitsios, Panagiotis Liakos, Katia Papakonstantinopoulou, Nikos Giatrakos, Yannis Kotidis What Drives Learned Optimizer Performance? A Systematic Evaluation Kostas Mparmparousis, Christos Tsapelas, Georgia Koutrika BS-tree: A gapped data-parallel B-tree Dimitrios Tsitsigkos, Achilleas Michalopoulos, Nikos Mamoulis, Manolis Terrovitis Multi-Query Optimization for the Novel Analyze Operator Marios Iakovidis, Panos Vassiliadis Fast Indexing for Temporal Information Retrieval Christian Rauch, Panagiotis Bouros
16:00 - 16:30	Coffee Break
16:30 - 17:30	Talks III (Click to expand details) (5 papers @ 10+2min each) Session Papers: Achieving Socio-Economic Parity through the Lens of EU AI Act Arjun Roy, Stavroula Rizou, Akis Papadopoulos, Eirini Ntoutsi Chunked Data Shapley: A Scalable Dataset Quality Assessment for Machine Learning Andreas Loizou, Dimitrios Tsoumakos Interpretable Highlights for Experiment Tracking Vassilis Stamatopoulos, Panos Gidarakos, Stavros Maroulis, George Papastefanatos, Panos Vassiliadis Alpine: Partial Unlabeled Graph Alignment Petros Petsinis, Konstantinos Skitsas, Sayan Ranu, Davide Mottin, Panagiotis Karras Scalable Grid-based Computation of Kendall's Tau Correlation Nikolaos Koutroumanis, Petros Karampas, Alexandros Karakasidis, Nikos Mamoulis, Panos Vassiliadis
17:30 - 18:00	HDMS 20th Anniversary celebration
20:00	Gala Dinner Cityzen Athens, Monastiraki

Day 2 - July 3rd, 2026Language: English

Time	Session Details
09:00 - 09:10	Welcome from the Hellenic ACM SIGMOD Chapter
09:10 - 09:30	Best Dissertation talk
09:30 - 10:30	Keynote II Scalable Data Management and Analytics for Modern Observability Nesime Tatbul (Intel Labs & MIT)
10:30 - 11:00	Coffee Break
11:00 - 11:30	Lightning Talks II (Click to expand details) (14 papers @ 2min each) Session Papers: Trajlearn: trajectory prediction learning using deep generative models. Amirhossein Nadiri, Jing Li, Ali Faraji, Ghadeer Abuoda, Manos Papagelis MUFASA: Fast and Accurate Multivariate Time-Series Clustering Haojun Li, John Paparrizos Adaptive Data Prefetching for File Storage Systems Using Online Machine Learning George Savva, Herodotos Herodotou Towards Efficient Oblivious Messaging with Unified Trust Assumptions Ioannis Barous Can LLMs Predict Citation Intent? An Experimental Analysis of In-Context Learning and Fine-Tuning on Open LLMs Paris Koloveas, Serafeim Chatzopoulos, Thanasis Vergoulis, Christos Tryfonopoulos Opinion Depolarization in Social Networks using GNNs Konstantinos Mylonas, Thrasyvoulos Spyropoulos CardioSynth: privacy-preserving generation and evaluation of multimodal synthetic data for cardiovascular research Konstantinos Kechagias, Michele Miranda, Minos Garofalakis, Edwin Morley-Fletcher, Yannis Ioannidis, Sebastien Bratieres, M.J. Boonstra, Claudio Capelli Nova: Scalable Streaming Join Placement and Parallelization in Resource-Constrained Geo-Distributed Environments Eleni Tzirita Zacharatou Hercules: Fast Analysis No Paralysis in GaussDB Antonios Katsarakis, Vasilis Gavrielatos, Evangelos Vazaios, Maurice Bailleu, Evangelos Maliaroudakis, Giorgos Stilianakis, Massimo Perini, Mahesh Dananjaya, Colin Reynolds, Pawel Guzewicz, Antonis Papaioannou, Lefteris Zervakis, Anderson Chaves Carniel, Zhang Jiahao, Zhou Pinggao, Pratanu Roy, Nikos Ntramos A Multiple Compression Approach using Attribute-based Signatures Constantinos Costa, Panos Chrysanthis, Herodotos Herodotou, Marios Costa, Efstathios Stavrakis, Nicolas Nicolaou Auto-Bench: A Pattern-Driven Benchmark Generator for Graph Databases Demo Theofilos Mailis EcoCharge+: A Platform for Sustainable EV Charging using Micro Grids Demo Eleni Michala, Soteris Constantinou, Constantinos Costa, Andreas Konstantinidis, Mohamed F. Mokbel, Demetris Zeinalipour VEnOM: A Vector Embedding Operator Modelling Framework Demo Andreas Loizou, Nikolaos Andriotis, Dimitrios Tsoumakos Practical Spreadsheet Parsing with SheetReader Demo Haralampos Gavriilidis, Felix Henze, Joel Ziegler, Jonas Benn, Eleni Tzirita Zacharatou, Volker Markl
11:30 - 12:30	Tutorial A Tutorial on NebulaStream: Stream Processing in the Cloud-Edge Continuum Yannik Schröder, Thanasis Georgiadis (Technische Universität Berlin)
12:30 - 13:30	Lunch
13:30 - 14:30	Poster + Demo Session
14:30 - 16:00	Talks IV (Click to expand details) (7 papers @ 10+2min each) Session Papers: Training and validating a treatment recommender with partial verification evidence Vishnu Unnikrishnan, Clara Puga, Miro Schleicher, Uli Niemann, Berthold Langguth, Stefan Schoisswohl, Birgit Mazurek, Rilana Cima, Jose Antonio Lopez Escamez, Dimitris Kikkidis, Eleftheria Vellidou, Ruediger Pryss, Winfried Schlee, Myra Spiliopoulou HYDRA: A Multi-Level Hierarchy-Driven Approach for Robust Anomaly Detection in Time Series Mingyi Huang, Qinghua Liu, Paul Boniol, John Paparrizos The LAW theorem: Local Reads and Linearizable Asynchronous Replication Antonios Katsarakis, Emmanouil Giortamis, Vasilis Gavrielatos, Pramod Bhatotia, Aleksandar Dragojevic, Boris Grot, Vijay Nagarajan, Panagiota Fatourou Indexing and Search Algorithms for Large Language Models on the Edge Stelios Christou, Konstantin Krasovitskiy, Andreas Konstantinidis, Demetris Zeinalipour TABFAIRGDT: A Fast Fair Tabular Data Generator using Autoregressive Decision Trees Emmanouil Panagiotou, Benoît Ronval, Arjun Roy, Ludwig Bothmann, Bernd Bischl, Siegfried Nijssen, Eirini Ntoutsi AvengER: Ensembling and Fine-Tuning LLMs for SELECT Prompts in Entity Resolution Alexandros Zeakis, George Papadakis, Dimitrios Skoutas, Manolis Koubarakis FIRAS: A Framework for Interval Range Search and Sampling Daichi Amagata, Panagiotis Simatis, Panagiotis Bouros, Nikos Mamoulis
16:00 - 16:20	Coffee Break
16:20 - 16:45	Talks V (Click to expand details) (2 papers @ 10+2min each) Session Papers: Analyzing Near-Network Hardware Acceleration with Co-Processing on DPUs Dimitrios Giouroukis, Dwi Nugroho, Varun Pandey, Steffen Zeuch, Volker Markl DARTH: Declarative Recall Through Early Termination for Approximate Nearest Neighbor Search Manos Chatzakis, Yannis Papakonstantinou, Themis Palpanas
16:45 - 17:05	Sponsor Talk (2 talks @ 10min each) Fragkiskos Pentaris (COSMOTE TELEKOM) Nikos Aslanidis, Dimitris Tempelis (Deloitte)
17:05 - 18:05	Panel Discussion Data Management: the Day After Tomorrow (in Greece/Cyprus and Beyond)