Bug 135790 ClassCastException in RowData.
ClassCastException is thrown in RowData line 81(IBaseExpression expr = ( IBaseExpression ) valueExpressions.get( index - 1 );).
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/TableItemExecutor.java
{
		private Table layout;
		private IContentEmitter emitter;
		private BufferedReportEmitter cellEmitter;
		TableLayoutEmitter( TableItemDesign design, IContentEmitter emitter )
		{
			layout = new Table( 0, design.getColumnCount( ) );
			this.emitter = emitter;
		}
		public void startRow( IRowContent row )
		{
			layout.createRow( row );
		}
		public void endRow( IRowContent row )
		{
			
			
			
			
		}
		public void startCell( ICellContent cell )
		{
			cellEmitter = new BufferedReportEmitter( emitter );
			int colId = cell.getColumn( );
			int colSpan = cell.getColSpan( );
			int rowSpan = cell.getRowSpan( );