[dathinab]

Their definition about Hybrid Search is I think wrong.

Through this terms tend to not be consistently defined at all, so "wrong" is maybe the wrong word.

Their definition seem to be about filtering results during (approximate) KNN vector search.

But that is filtering, not hybrid search. Through it might sometimes be implemented as a form of hybrid search, but that's an internal implementation detail and you probably should hope it's not implemented that way.

Hybrid search is when you do both a vector search and a more classical text based search (e.g. bm25) and combine both results in a reasonable way.

[emilfroberg]

The way you explain hybrid search aligns with my understanding. Pinecone has a good article about it here https://www.pinecone.io/learn/hybrid-search-intro/. From my understanding, all vector DBs support this.