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 refresh
	 * @return
	 */
	public DataSetViewData[] getColumns( String dataSetName, boolean refresh )
	{
		ModuleHandle handle = Utility.getReportModuleHandle( );
		DataSetHandle dataSet = handle.findDataSet( dataSetName );
		if ( dataSet == null )
		{
			return new DataSetViewData[]{};
		}
		return getColumns( dataSet, refresh );
	}
	/**
	 * get column data by data set handle
	 * @param dataSet
	 * @param refresh
	 * @return
	 */
	public DataSetViewData[] getColumns( DataSetHandle dataSet, boolean refresh )
	{
		return getColumns( dataSet, refresh, true, false );
	}
	/**
	 * 
	 * @param dataSet
	 * @param refresh
	 * @param useColumnHints
	 *            Only applicable if the list is refreshed.
	 * @return