How a group row shows a column, where it differs from the default
(getDefaultDrilldownAggregation): an aggregation function, or null to
leave the column empty. The function is kept as saved, so an unknown one
is held and reported, never dropped (as a Group's, PLAN ยง11.5).
How a group row shows a column, where it differs from the default (
getDefaultDrilldownAggregation): an aggregation function, ornullto leave the column empty. The function is kept as saved, so an unknown one is held and reported, never dropped (as a Group's, PLAN ยง11.5).