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
odiQuery = createOdiQuery( );
			populateOdiQuery( );
			prepareOdiQuery( );
			isPrepared = true;
		}
		
		/**
		 * @return
		 * @throws DataException
		 */
		public IResultMetaData getResultMetaData( ) throws DataException
		{
			assert odiQuery instanceof IPreparedDSQuery
					|| odiQuery instanceof ICandidateQuery;
			if ( odiQuery instanceof IPreparedDSQuery )
			{
				if ( ( (IPreparedDSQuery) odiQuery ).getResultClass( ) != null )
					return new ResultMetaData( ( (IPreparedDSQuery) odiQuery ).getResultClass( ) );
				else
				    return null;
			}
			else
			{
				return new ResultMetaData( ( (ICandidateQuery) odiQuery ).getResultClass( ) );
			}
		}
		
		/**
		 * @throws DataException