CompositeMultiValueColumn

[sgratzl]

CompositeNumberColumn is a composite for number columns and itself a number column.

a similar thing for multi value columns would be useful.

e.g. show the "summarized" boxplot of all children

[alexsb]

Something like this:

Basics of a box plot, the darker areas show the possible positions of the mean for B and C.

Or this:

The black violin plots are the distribution of only that variable, the red ones show cumulative uncertainty.