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
*/
	public DataSetViewData[] getColumns( DataSetHandle dataSet,
			boolean refresh, boolean useColumnHints,
			boolean suppressErrorMessage )
	{
		if ( dataSet == null )
		{
			return new DataSetViewData[0];
		}
		DataSetViewData[] columns = null;
		try
		{
			DataSessionContext context = new DataSessionContext( DataSessionContext.MODE_DIRECT_PRESENTATION,
					dataSet.getModuleHandle( ) );
			DataRequestSession session = DataRequestSession.newSession( context );
			
			columns = (DataSetViewData[]) htColumns.get( dataSet );
			
			if ( columns == null || refresh )
			{
				columns = this.populateAllOutputColumns( dataSet, session );
				htColumns.put( dataSet, columns );
			}
			session.shutdown( );
		}
		catch ( BirtException e )
		{
			if ( !suppressErrorMessage )
			{
				ExceptionHandler.handle( e );