Transducers

[mamcx]

Hi, I'm exploring the use of transducers on rust, I have a small POC here:

https://gist.github.com/mamcx/b57f557fda1a3e99cfff6e2276054b0e

in case you consider it interesting.

BTW, I'm struggling in implement "zip/sql-like joins" in case you know where to look :)