Bug 190769 [Regression]The attached report pop up exception when preview
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/QueryResultSet.java
* @param index
		 *            The projected column index.
		 * @return The label of the specified column.
		 * @throws BirtException
		 *             if given index is invalid.
		 */
		public String getColumnLabel( int index ) throws BirtException
		{
			return null;
		}
		/**
		 * Indicates whether the specified projected column is defined as a
		 * computed column. A computed column is one that is not retrieved from
		 * the underlying data provider. Only those computed columns declared
		 * explicitly in a data set design are considered as "computed" columns.
		 * 
		 * @param index
		 *            The projected column index.
		 * @return true if the given column is a computed column; false
		 *         otherwise.
		 * @throws BirtException
		 *             if given index is invalid.
		 */
		public boolean isComputedColumn( int index ) throws BirtException
		{
			return false;
		}
	}
}