TEMPORAL JOINS: We loose the original temporal boundaries
Created by: Piiit
Normally a join operation does not remove any columns. The temporal join discards the original boundary values (i.e., the columns that get internally renamed to Us/Ue and Vs/Ve).
The question is: Should we keep them and rename them back to the original bound column names (for example, Ts/Te)?
Belongs to #55, #65 (closed), and #85 (closed)