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
		 */
		abstract protected DataSetRuntime newDataSetRuntime( )
				throws DataException;
		/**
		 * Create an empty instance of odi query
		 * 
		 * @return
		 */
		abstract protected IQuery createOdiQuery( ) throws DataException;
		
		/**
		 * Executes the ODI query to reproduce a ODI result set
		 * 
		 * @return
		 */
		abstract protected IResultIterator executeOdiQuery( )
				throws DataException;
		/**
		 * Prepares the ODI query
		 */
		protected void prepareOdiQuery( ) throws DataException
		{
		}
		
		/**
		 * Constructor
		 */
		public Executor( )
		{