Bug 129144 Support suppressDuplicates property on table row in report engine
See 129143 for detail. This only needs to be supported for data item in a detail row of a table.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/DataItemExecutor.java
* @param context
	 *            the executor context
	 * @param itemEmitter
	 *            the emitter
	 */
	public DataItemExecutor( ExecutionContext context,
			IReportItemVisitor visitor )
	{
		super( context, visitor );
	}
	/**
	 * execute the data item.
	 * 
	 * <li> create the data content object
	 * <li> push it to the stack
	 * <li> open the data set, seek to the first record
	 * <li> intialize the content object
	 * <li> process the style, visiblitly, action and bookmark
	 * <li> evaluate the expression, and map it to a predefined value.
	 * <li> call the onCreate if necessary
	 * <li> pass it to emitter
	 * <li> close the data set if any
	 * <li> pop the stack.
	 * 
	 * @see org.eclipse.birt.report.engine.excutor.ReportItemLoader#execute()
	 */
	public void execute( ReportItemDesign item, IContentEmitter emitter )
	{
		DataItemDesign dataItem = (DataItemDesign) item;
		IDataContent dataObj = report.createDataContent( );