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
String uniqueColumnName = getUniqueName( orgColumnNameSet,
					uniqueColumnNameSet,
					columnName,
					n );
			
			columns[n].setDataSetColumnName( uniqueColumnName );
			uniqueColumnNameSet.add( uniqueColumnName );
			
			if ( !uniqueColumnName.equals( columnName ) )
				updateModelColumn( dataSet, columns[n] );
		}
		updateModel( dataSet, columns );
		htColumns.put( dataSet, columns );
	}
	
	/**
	 * 
	 * @param ds
	 * @param column
	 */
	private void updateModelColumn( DataSetHandle ds, DataSetViewData column )
	{
		PropertyHandle resultSetColumns = ds.getPropertyHandle( DataSetHandle.RESULT_SET_PROP );
		if ( resultSetColumns == null )
			return;
		
		Iterator iterator = resultSetColumns.iterator( );
		if ( iterator == null )
			return;