Feature Request: Visualization to drag/drop simple summary table

When thinking about EDA, and more specifically teaching the concept of really diving into the data, sometimes its really nice to simply drag/drop a few attributes around to rows/columns and either create counts or summarize a single variable.  

The count/aggregation could be as simple as 1 per table, but ideal state, we could include row count and include another stat (row/column/total %, or an aggregation like average) per cell. 

Margin totals (row/column/total) would help reinforce the elements of "what are we looking at" and help students think about how data can take vary shapes, especially when thinking about aggregates and summaries.  

I am aware we can code something up using a variety of operators, but admittedly, it's nice to just drag/drop some columns  as you are exploring and hypothesizing (e.g. Tableau style "table" explorations) a dataset that you have never seen before.