Bug 124251 the data cann't been exported.
Description: the data cann't been exported. Steps to reproduce: 1. new a report 2. new a datasource and a data set(DS_A) 3. use an external library 4. drag a table to the report layout from the imported library 5. insert an another table into the layout of the report and bind the data set(DS_A) 6. preview in the 'Web Viewer' and export the data Actual result: The data can been exported. Expect result: The data can been exporteded
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/DataExtractionTask.java
implements
			IDataExtractionTask
{
	protected ReportDocumentReader reportDocReader;
	
	protected ComponentID componentId;
	
	protected InstanceID instanceId;
	
	protected String[] selectedColumns;
	
	protected Report report;
	
	protected List resultMetaList;