Bug 201699 Enhance the execution of the topN of maximum member count of level[1102]
Description: The TopN filter of maximum member count of level will execute twice, although that will take no effect on the results, the performance is not good. So please enhance the execution of the member count of level Regards!
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/DteDataEngine.java
{
				dteEngineContext.setTmpdir( tempDir );
			}
			dteSession = DataRequestSession.newSession( dteSessionContext );
		}
		catch ( Exception ex )
		{
			 
			logger.log( Level.SEVERE, "can't create the DTE data engine", ex );
		}
	}
	
	/**
	 * this constructor is used 
	 * @param context
	 * @param obj
	 */
	protected DteDataEngine( ExecutionContext context, Object obj )
	{
		super( context );
	}
	protected IBaseResultSet doExecuteQuery( IBaseResultSet parentResultSet,
			IQueryDefinition query, boolean useCache )
	{
		IPreparedQuery pQuery = (IPreparedQuery) queryMap.get( query );
		if ( pQuery == null )
		{
			return null;
		}
		try