Bug 190769 [Regression]The attached report pop up exception when preview
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/QueryResultSet.java
.getName( ) );
	
	public QueryResultSet( IDataEngine dataEngine, ExecutionContext context,
			IQueryDefinition queryDefn, IQueryResults rsets )
			throws BirtException
	{
		this.parent = null;
		this.context = context;
		this.dataEngine = dataEngine;
		this.queryDefn = queryDefn;
		this.id = new DataSetID( rsets.getID( ) );
		this.rs = rsets.getResultIterator( );
		this.queryResults = rsets;
		initializeRowIdOfGroups( getGroupCount( ) );
	}
	
	public QueryResultSet( IDataEngine dataEngine, ExecutionContext context,
			IBaseResultSet parent, IQueryDefinition queryDefn,
			IQueryResults rsets ) throws BirtException
	{
		assert parent != null;
		this.parent = parent;
		this.id = new DataSetID( rsets.getID( ) );
		this.context = context;
		this.dataEngine = dataEngine;
		this.queryDefn = queryDefn;
		this.rs = rsets.getResultIterator( );
		this.queryResults = rsets;
		initializeRowIdOfGroups( getGroupCount( ) );
	}