Feature Requests: XOR/^ and POPCNT() for similarity/hamming distance

Feature Requests
1

One thing I’d love to be able to do is store various SimHashes per document. I could then XOR the two values and take the POPCNT of the result (the hamming distance) as a quick measure of similarity. Being able to name and order on that field could then be a quick and easy way to find similar documents.

A query would look something like this:

SELECT *, POPCNT(this.simhash ^ other.simhash) as similarity
WHERE …
AND similarity <= 5
ORDER BY similarity DESC LIMIT 10

2

you could write your own udf expression as described at the manual Extensions > UDFs and Plugins > UDFs and Plugins | Manticore Search Manual and use it in the select list