Bug 122306 TOC on group won't be displayed
Description: TOC on group won't be displayed Steps to reproduce: 1.Add a sample datasource and a data with table "CUSTOMERS" 2.Add a table binding with data set 3.Add a group on the table and set the toc expression to "Group" 4.Preview in HTML Expected result: TOC "Group" will be displayed on the TOC pane Actual result: Nothing in the TOC pane
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
* 
		 * @see org.eclipse.birt.report.engine.ir.IReportItemVisitor#visitDataItem(org.eclipse.birt.report.engine.ir.DataItemDesign)
		 */
		public Object visitDataItem( DataItemDesign data, Object value )
		{
			BaseQueryDefinition query = prepareVisit( data );
			handleReportItemExpressions( data );
			handleAction( data.getAction( ) );
			addExpression( data.getValue( ) );
			finishVisit( query );
			return value;
		}
		/**
		 * handle expressions common to all report items
		 * 
		 * @param item
		 *            a report item
		 */
		protected void handleReportItemExpressions( ReportItemDesign item )
		{
			if ( item.getVisibility( ) != null )
			{
				for ( int i = 0; i < item.getVisibility( ).count( ); i++ )
				{
					addExpression( item.getVisibility( ).getRule( i )
							.getExpression( ) );
				}
			}
			addExpression( item.getTOC( ) );
			addExpression( item.getBookmark( ) );