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
{
				return IGroupDefinition.YEAR_INTERVAL;
			}
			if ( DesignChoiceConstants.INTERVAL_MONTH.equals( interval ) )
			{
				return IGroupDefinition.MONTH_INTERVAL;
			}
			if ( DesignChoiceConstants.INTERVAL_WEEK.equals( interval ) )  
			{
				return IGroupDefinition.WEEK_INTERVAL;
			}
			if ( DesignChoiceConstants.INTERVAL_QUARTER.equals( interval ) )
			{
				return IGroupDefinition.QUARTER_INTERVAL;
			}
			if ( DesignChoiceConstants.INTERVAL_DAY.equals( interval ) )
			{
				return IGroupDefinition.DAY_INTERVAL;
			}
			if ( DesignChoiceConstants.INTERVAL_HOUR.equals( interval ) )
			{
				return IGroupDefinition.HOUR_INTERVAL;
			}
			if ( DesignChoiceConstants.INTERVAL_MINUTE.equals( interval ) )
			{
				return IGroupDefinition.MINUTE_INTERVAL;
			}
			if ( DesignChoiceConstants.INTERVAL_PREFIX.equals( interval ) )
			{
				return IGroupDefinition.STRING_PREFIX_INTERVAL;