Bug 206279 Removed computed cols listed in expression builder[07]
Description: Removed computed column listed in expression builder inside DataSet Editor dialog Build number:2.2.2.v20071011 Steps to reproduce: 1. New data source and dataset. 2. Add a computed column in dataset and click OK. 3. Open the dataset, remove the computed column. 4. Add a new computed column and check columns in available Data Sets. Expected result: The removed computed column isn't there. Actual result: The removed computed column is still there for selection. Error log:n/a
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
return session.getModelAdaptor( ).adaptDataSource( dataSource );
	}
	
	/**
	 * Get cached data set item model. If none is cached, return null;
	 * 
	 * @param ds
	 * @param columns
	 */
	public DataSetViewData[] getCachedDataSetItemModel( DataSetHandle ds )
	{
		DataSetViewData[] result = (DataSetViewData[]) this.htColumns.get( ds );
		if ( result == null )
		{
			DataRequestSession session;
			try
			{
				DataSessionContext context = new DataSessionContext( DataSessionContext.MODE_DIRECT_PRESENTATION,
						ds.getModuleHandle( ) );
				session = DataRequestSession.newSession( context );
				result = this.populateAllOutputColumns( ds, session );
				return result;
			}
			catch ( BirtException e )
			{
				result = new DataSetViewData[0];
			}
		}
		return result;
	}