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cs.DB2026
The Case for Cardinality Lower Bounds
Mihail Stoian, Tiemo Bang, Hangdong Zhao +3
Despite decades of research, cardinality estimation remains the optimizer's Achilles heel, with industrial-strength systems exhibiting a systemic tendency toward underestimation. A…
cs.DB2025
GRACEFUL: A Learned Cost Estimator For UDFs
Johannes Wehrstein, Tiemo Bang, Roman Heinrich +1
User-Defined-Functions (UDFs) are a pivotal feature in modern DBMS, enabling the extension of native DBMS functionality with custom logic. However, the integration of UDFs into que…