private boolean doingDynamicDatasetBySpecialDataset = false ;
protected QueryEngineTDB(Query query, DatasetGraphTDB dataset, Binding input, Context cxt)
{
super(query, dataset, input, cxt) ;
DatasetDescription dsDesc = DatasetDescription.create(query, context) ;
if ( dsDesc != null )
{
doingDynamicDatasetBySpecialDataset = true ;
super.dataset = DynamicDatasets.dynamicDataset(dsDesc, dataset, cxt.isTrue(TDB.symUnionDefaultGraph) ) ;