https://download.eclipse.org/nattable/releases/2.4.0/apidocs/org/eclipse/nebula/widgets/nattable/extension/glazedlists/groupBy/GroupByDataLayer.GroupDescriptorMatcher.html
GroupByDataLayer.GroupDescriptorMatcher (Nebula NatTable 2.4.0-SNAPSHOT API)
declaration: package: org.eclipse.nebula.widgets.nattable.extension.glazedlists.groupBy, class: GroupByDataLayer, class: GroupDescriptorMatcher
nebulanattablesnapshotapi