NL: Rank a variable/topic based on another qualifier variable

[jehangiramjad]

Example Queries: what state has the cheapest housing costs based on the median income there

In this case, the "median income" is a constraint/qualifier for the housing costs. This is a bit difficult ti interpret because it is not a simple filter (e.g. do we do a correlation plot here?). But even if that is not possible, we should support additional constraints.