Bug 123726 "Top n", "Bottom n" in highlight dialog doesn't work.
Description: "Top n", "Bottom n" in highlight dialog doesn't work. Steps to reproduce: 1. Add a highlight for a table. 2. Set highlight rule: "account_id", "top n", "3", let its font color red. 3. Preview the report, it doesn't work. Attached is design file.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedQuery.java
return subquery.execute( iterator, subScope );
	}
	
	/**
	 * @return
	 */
	DataEngineImpl getDataEngine()
	{
		return engine;
	}
	
	/**
	 * Closes the prepared query. This instance can no longer be executed after
	 * it is closed 
	 * 
	 * TODO: expose this method in the IPreparedQuery interface
	 */
	public void close()
	{
		queryDefn = null;
		this.aggrTable = null;
		this.engine = null;
		this.subQueryMap = null;
		logger.logp( Level.FINER,
				PreparedQuery.class.getName( ),
				"close",
				"Prepared query closed" );
		
	}