Subtotal viz: table calculation column is displayed as [object Object] in merge result

[xin-looker]

It seems this is due to the fact merge result does not support table calculation in the explore, however when it's in merge result, table calc column can be displayed beacause it's treated as measure, however the name is displayed as [object Object], this causes some inconvenience to the users.

[sunnygud]

@xin-looker
we are in the process of consuming the SubTotal Viz. How safe is it? it has series of lines... does that execute any code to read the data from rest and pass it on the hosted server? does the data get compromised anywhere?

https://github.com/looker/custom_visualizations_v2/tree/master/src/examples/subtotal

Here is the Subtotal JS we are trying to load in to our Dev to test the functionality, this will help in what we are trying to achieve. Any feedback is really appreciated.