Bug 102511 Enhance Highlighting to support Banding
Using the highlight feature to create a banded report results in a messy report. To recreate, create a simple tabular report. In the designer, select the detail row, go to the Highlights tab on the Property Editor view. Add a new highlight, set its condition to be "row[0] % 2" "Equals" "0". Set the formatting for the highlight to have a gray background color. When the report is previewed, alternating rows have a background color for each cell. The issue is that the backgrounds for the cells are not contiguous, there are spaces between each cell's background, and if a cell has a null value there is no background color. In this situation the highlight should apply to the row, instead it is being applied to each cell. If I manually set the background of a detail row to be gray I get the effect I want.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
* A helper function for removing a query from query stack
		 */
		protected void popQuery( )
		{
			assert !queryStack.isEmpty( );
			queryStack.removeLast( );
		}
		/**
		 * add expression to the expression collection on top of the expressions
		 * stack
		 * 
		 * @param expr
		 *            expression to be added
		 */
		protected void addExpression( IBaseExpression expr )
		{
			
			
			if ( expr != null && expressions != null )
				expressions.add( expr );
		}
		/**
		 * @return topmost element on query stack
		 */
		protected IBaseTransform getTransform( )
		{
			if ( queryStack.isEmpty( ) )
				return null;
			return (IBaseTransform) queryStack.getLast( );
		}