I am mostly interested in anything that requires C/C++ implementation and AlgoDS.
For that reason I would love to work in any of the following (in that order of preference):
Sorting algorithms benchmark and implementation
Enhancing amcheck for all AMs
TOAST'ing in slices
Thrift datatype support
I can work on any of the previous stated ones, so I am waiting on your feedback/insights on which one to choose.
I don't suppose I can interest you in wire-protocol compression support instead? Probably not if you're more interested in an algorithms and data science angle. But I can hope ;)