display ANI in search results?

[ctb]

Once #1967 is merged, ANI will available in CSV files! 🎉

It is also available in sourmash compare matrix output, if --ani is used. 🎉

I don't think it is displayed anywhere else.

Do we want to add ANI to the search output, @bluegenes? I'm in favor - the search results are pretty sparse so I think we even have room for them.

Not sure about gather, though. I think the k-mer overlap approaches makes more sense, maybe? But it would be nice to have as an option, maybe? 🤔

Maybe do it for search first, since I'm pretty sure that's a good idea, and then a separate PR (no hurry) for gather?

[bluegenes]

ANI to search output would be great, but a few thoughts:

• we can't estimate ANI for num signatures, so num vs scaled outputs would be different (maybe they already are?)
• search uses Jaccard by default, which isn't as good as containment for ANI. Does adding ANI to the search output encourage use of jaccard--> ANI?
• How do we want to handle excessive jaccard error? Currently emit a warning, do we want to zero out?
• Do we want to allow ANI estimation for abund searches (ANI ignores abundance)? If so, from jaccard?

[ctb]

we can't estimate ANI for num signatures, so num vs scaled outputs would be different (maybe they already are?)

ahh, I'd kinda forgotten that.

[bluegenes]

ahh, I'd kinda forgotten that.

we could actually estimate ANI from num sketches using the Mash Distance, but I'd rather not, because:

1. don't want to confuse folks / have them use the ANI's interchangeably
2. want to encourage transition to FracMinHash

[ctb]

agreed.