Bug 201396 Exception is thrown out when a chart use the list shared result set [0005]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryResults.java
* 
	 * @see org.eclipse.birt.data.engine.api.IQueryResults#close()
	 */
	public void close( ) throws BirtException
	{
		if ( this.queryService == null )
		{
			
			return;
		}
		if ( iterator != null )
		{
			iterator.close( );
			iterator = null;
		}
	    
		queryService.close( );
		queryService = null;
		logger.logp( Level.FINE,
				QueryResults.class.getName( ),
				"close",
				"QueryResults is closed" );
	}
	
	/**
	 * @param rootQueryResultID
	 * @param selfQueryResultID
	 */
	void setID( String rootQueryResultID, String selfQueryResultID )
	{