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
* @param useColumnHints
	 * @param rowsToReturn
	 * @return
	 * @throws BirtException
	 */
	public IQueryResults execute( DataSetHandle dataSet,
			boolean useColumnHints, boolean useFilters, int rowsToReturn,
			DataRequestSession session ) throws BirtException
	{
	    populateAllOutputColumns( dataSet, session );
		IBaseDataSetDesign dataSetDesign = session.getModelAdaptor( )
				.adaptDataSet( dataSet );
		if ( !useColumnHints )
		{
			dataSetDesign.getResultSetHints( ).clear( );
		}
		if ( !useFilters )
		{
			dataSetDesign.getFilters( ).clear( );
		}
		
		QueryDefinition queryDefn = getQueryDefinition( dataSetDesign,
				rowsToReturn );
		IQueryResults resultSet = executeQuery( session, queryDefn );
		saveResultToDataItems( dataSet, resultSet );
		return resultSet;
	}
	/**
	 * 
	 * @param dataSet