Bug 192083 [regression]DataException when preview attached xtab report.[1102]
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataRequestSessionImpl.java
query.setDataSetName( dataSet.getQualifiedName( ) );
		GroupDefinition group = new GroupDefinition( boundColumnName );
		group.setKeyColumn( boundColumnName );
		query.addGroup( group );
		query.setUsesDetails( false );
		ModuleHandle moduleHandle = sessionContext.getModuleHandle( );
		if ( moduleHandle == null )
			moduleHandle = dataSet.getModuleHandle( );
		QueryExecutionHelper execHelper = new QueryExecutionHelper( this.dataEngine,
				this.modelAdaptor,
				this.sessionContext );
		IQueryResults results = execHelper.executeQuery( query,
				inputParamBindings,
				null,
				columnBindings );
		return results;
	}
	/**
	 * This method is used to validate the column binding to see if it contains aggregations.
	 * If so then return true, else return false;
	 * 
	 * @param columnBindings
	 * @param boundColumnName
	 * @throws BirtException
	 */
	private boolean referToAggregation( List bindings,
			String boundColumnName ) throws BirtException
	{
		if ( boundColumnName == null )
			return true;