Roman Heinrich

COSTREAM: Learned Cost Models for Operator Placement in Edge-Cloud Environments

2024 · arXiv (Cornell University)

In this work, we present COSTREAM, a novel learned cost model for Distributed Stream Processing Systems that provides accurate predictions of the execution costs of a streaming query in an edge-cloud environment. The cost model …

Opening the Black-Box: Explaining Learned Cost Models for Databases

2025 · Proceedings of the VLDB Endowment

Learned Cost Model s (LCMs) have shown superior results over traditional database cost models as they can significantly improve the accuracy of cost predictions. However, LCMs still fail for some query plans, as prediction errors …