Bug 201013 [Automation][Regression]Invalid group key column name: _{$TEMP_GROUP_1$} occurs when preview attached report[1102]
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/QueryExecutor.java
/**
	 * Open the required DataSource. This method should be called after
	 * "dataSource" is initialized by findDataSource() method.
	 * 
	 * @throws DataException
	 */
	protected void openDataSource( ) throws DataException
	{
		assert odiDataSource == null;
		
		
		if ( dataSource != null )
		{
			
			if ( !dataSource.isOpen( )
					|| session.getDataSetCacheManager( ).doesLikeToCache( ) == true )
			{
				
				
				
				dataSource.beforeOpen( );
				
				odiDataSource = createOdiDataSource( );
				 
				
				odiDataSource.setAppContext( queryAppContext );
				
				dataSource.openOdiDataSource( odiDataSource );
				dataSource.afterOpen( );
			}