Bug 123727 the 'Top N' and 'Buttom N' do not work
Description: the 'Top N' and 'Buttom N' do not work Steps to reproduce: 1. new a report 2. new a datasource and a dataset 3. creat a report parameter, 4. drag a chart to the layout, In chart dialogue, click the 'select data' tab and click the button 'filters'. 5. set two filters condition, one is used the 'Top N' function and the other used the report parameter. 6. save and preview Actual result: NO data are displayed. Expect result: The data displayed according to the 'Top N' and 'Input Parameters'
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/NEvaluator.java
rowIdList = null;
				valueList = null;
				N = -1;
		}
	}
	protected abstract Object doCompare( Object value1, Object value2 ) throws DataException;
}
/**
 * The class that provides "Top N" calculation service
 *
 */
class TopNEvaluator extends NEvaluator
{
	protected Object doCompare( Object value1, Object value2 ) throws DataException
	{
		return ScriptEvalUtil.evalConditionalExpr2( value1, IConditionalExpression.OP_GT, value2, null);
	}
}
/**
 * The class that provides "Bottom N" calculation service
 *
 */
class BottomNEvaluator extends NEvaluator
{
	protected Object doCompare( Object value1, Object value2 ) throws DataException
	{
		return ScriptEvalUtil.evalConditionalExpr2( value1, IConditionalExpression.OP_LT, value2, null);
	}
}