These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Aggregator used for parent rows of the projected tree, in the
treeView and rowGrouping features.
When provided as a string, the function is applied to every row that
has children in the projected tree, overriding the row's source
value. Structural columns such as data.idColumn,
treeView.input.pathColumn, treeView.input.parentIdColumn, and
rowGrouping.groupBy columns never aggregate, even if configured.
When provided as a callback, it is invoked for matching parent rows and should return a registered Formula processor function name, or a falsy value to skip aggregation for the current row.
Set it in columnDefaults to aggregate every column the same way,
and to false in a single column to reset that default.