## Details

## Description

There are many distance functions that are useful to have:

1. Great Circle (lat/lon) and other geo distances

2. Euclidean (Vector)

3. Manhattan (Vector)

4. Cosine (Vector)

For the vector ones, the idea is that the fields on a document can be used to determine the vector.

Hey Grant,

I'd love to help on this issue – do you have a preference regarding which one of the above 4 that you'd like to work on? All of them? 2 of them?

Let me know – I'd be happy to write 1 or 2 of them...

Cheers,

Chris