NEAREST BY Join: Scaling Vector Search in Databricks Runtime

Databricks has published an article titled "NEAREST BY Join: Scaling Vector Search in Databricks Runtime." The piece is framed around the NEAREST BY join as a way to scale vector search within the Databricks Runtime.
According to the accompanying excerpt, vector search originated as a serving problem. The excerpt states that the classical use case is a chatbot.
No further details about the join's implementation, performance characteristics, availability, or supported workloads were included in the headline or excerpt.
Based on reporting from the original publisher. Visit the source for full context and later updates.
Publisher excerpt
Vector search originated as a serving problem. The classical use case is a chatbot...