Bug 213663 [2.2.2][2.3.0]Exception occurs when preview a datetime type data with highlight rule
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/api/DataAdapterUtil.java
}
	
	/**
	 * This method is used to adapter model filter's operator into dte's
	 * operator
	 * 
	 * @param modelOpr
	 * @return
	 */
	public static int adaptModelFilterOperator( String modelOpr )
	{
		Integer operator = (Integer) filterOptMap.get( modelOpr );
		if ( operator != null )
			return ( (Integer) operator ).intValue( );
		else
			return IConditionalExpression.OP_NONE;
	}
	
	/**
	 * Get the rollup aggregation name. If the function is TOTAL_AVE_FUNC,
	 * TOTAL_COUNT_FUNC, or TOTAL_COUNT_DISTINCT_FUNC, return TOTAL_SUM_FUNC as
	 * measure function name
	 * 
	 * @param functionName
	 * @return
	 */
	public static String getRollUpAggregationName( String functionName )
	{
		if ( functionName == null || functionName.trim( ).length( ) == 0 )
			return functionName;