Bug 122854 There is redundant columns in "available columns" list in "export data" dialog.
Description: There is redundant columns in "available columns" list in "export data" dialog. Steps to reproduce: 1. Preview attached design in web viewer. 2. Select the table and click on "export" button. 3. There is a "detail" column name in "available columns" list which is not data set column.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/DataExtractionTask.java
private void loadResultSetMetaData( ) throws EngineException
	{
		IDocArchiveReader reader = reportDocReader.getArchive( );
		try
		{
			ObjectInputStream ois = new ObjectInputStream( reader
					.getStream( AbstractDataEngine.DATA_META_STREAM ) );
			
			mapQueryIDToResultSetName = (HashMap) ois.readObject( );
			ois.close( );
		}
		catch ( IOException ioe )
		{
			executionContext.addException( new EngineException(
					"Can't load the data in report document", ioe ) );
			logger.log( Level.SEVERE, ioe.getMessage( ), ioe );
		}
		catch ( ClassNotFoundException cnfe )
		{
			executionContext.addException( new EngineException(
					"Can't load the data in report document", cnfe ) );
			logger.log( Level.SEVERE, cnfe.getMessage( ), cnfe );
		}
	}
	
	public void setInstanceID( InstanceID iid )
	{
		instanceId = iid;
		currentResult = null;
	}