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\section{Related Work}
Druid \cite{druid2014} pioneered real-time OLAP with column-oriented storage and bitmap indexes. Verus extends this with richer analytical operators (cohorts, funnels) and hybrid query routing.
ClickHouse \cite{clickhouse2016} offers excellent single-node performance for analytical queries. Verus provides horizontal scalability and stream processing integration.
The Lambda architecture \cite{marz2015} inspired our hybrid approach. We simplify operations by unifying the query interface and automating routing decisions.