Bug 212478 Exception occurs when preview the table including a Autotext
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
{
				groupDefn.setInterval( parseInterval( interval ) );
			}
			
			groupDefn.setIntervalRange( handle.getIntervalRange( ) );
			
			groupDefn.setIntervalStart( handle.getIntervalBase( ) );
			
			String direction = handle.getSortDirection( );
			if ( direction != null )
			{
				groupDefn.setSortDirection( parseSortDirection( direction ) );
			}
			groupDefn.getSorts( ).addAll( createSorts( handle ) );
			groupDefn.getFilters( ).addAll( createFilters( handle ) );
			query.getGroups( ).add( groupDefn );
			return groupDefn;
		}
		/**
		 * visit content of a row
		 */
		public Object visitRow( RowDesign row, Object value )
		{
			BaseQueryDefinition query;
			if ( row.useCachedResult( ) )
			{
				query = getRefenceQuery( row );
				if ( query == null )
				{
					registerUnresolvedQueryReference( row );