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/script/ScriptEvalUtil.java
* @return
		 */
		private static boolean needFormat( Object obj, int operator,
				ExprTextAndValue op1, ExprTextAndValue op2 )
		{
			
			
			
			if ( operator < IConditionalExpression.OP_EQ
					|| operator > IConditionalExpression.OP_NOT_BETWEEN
					|| obj == null || op1.value == null )
				return false;
			
			else if ( ( operator == IConditionalExpression.OP_BETWEEN || operator == IConditionalExpression.OP_NOT_BETWEEN )
					&& op2.value == null )
				return false;
			
			return true;
		}
		
		/**
		 * To ease the methods compare and between. Exception with specific
		 * explanation will be thrown if anything goes wrong.
		 * 
		 * @param obj
		 * @param op1
		 * @param op2
		 * @return
		 * @throws DataException
		 */