Currently, interpolation is a function that allows users to estimate values from 1 column to another. However, in industry, it is very possible to have to interpolate across multiple columns. Having the option is cleaner an more accurate then using a multidimensional best fit curve to estimate
PI Server 2018 has been released.
Jinmo Yi commented
This is really important and requested feature in Power generation industry as well.
Many turbine's and/or other equipment performance is tabulated in accordance with more than 1 variables. Currently they are doing it in Excel or PI datalink which is a bit messy and hard to manage.