Add pg_embedding backend
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https://github.com/neondatabase/pg_embedding
pg_embedding is a new extension in the vector search space promissing quite a bit of speedup over pg_vector - https://neon.tech/blog/pg-embedding-extension-for-vector-search
See notes from #4
Note that pg_embedding is no longer supported by Neon as per the repo README:
As of Sept 29, 2023, Neon is no longer committing to pg_embedding.
Support will remain in place for existing users of the extension, but we strongly encourage migrating to pgvector.
Certainly not averse to supporting it if there is demand though.
uff, I missed that note.
Now found the blog post about pgvector implementing the pg_embedding algorithm - https://neon.tech/blog/pgvector-meets-hnsw-index
Given that the next blog post about vector indexing is about pgvector, and the note above - https://neon.tech/blog/understanding-vector-search-and-hnsw-index-with-pgvector, and https://neon.tech/blog/sunset-pgembedding - it is safe to not pursue this any further