Column aggregation allows us to do interesting things on the data of a grid's column, its implementation in the GXT
Grid component places a section underneath the rows where the aggregates show up for each column it is configured for.
With column aggregates, we can have an Average row (placed under/after the normal rows in the grid) that shows the average for a column with numeric data. Similarly, we can have a
Sum aggregate that shows the total for the data in such a column.
ColumnModel is where we add aggregates to a grid using the
addAggregationRow() method of the
ColumnModel class, which takes an