Bug 208419 NullPointerException at CubeResultSet close
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/DataInteractiveEngine.java
.getQueryResultsID( );
			}
			else
			{
				pRsetId = ( (CubeResultSet) parentResult )
						.getQueryResultsID( );
			}
			String rowid = parentResult.getRawID( );
			resultSetID = getResultID( pRsetId, rowid, queryID );
		}
		return resultSetID;
	}
	
	public void shutdown( )
	{
		if ( null != dos )
		{
			try
			{
				dos.close( );
			}
			catch ( IOException e )
			{
			}
			dos = null;
		}
		dteSession.shutdown( );
	}
}