SG9 saw this paper in St. Louis. We did not take any polls, but we asked that the author come back with the following pieces of information included in the paper:
A list of what other languages call this
A list of differences in semantics (if any) of this thing in other languages.
An investigation of optimization opportunities in a designated transform_join-view
P3211R0 views::transform_join (Hewill Kang)