Bug 207564 Column sorting based on data type
Only string sorting happens when a column is selected in preview result page of DataSet Editor irrespective of type of data shown in that column. I'd like to be able to sort the data based on its datatype when a column is selected.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
* @throws BirtException
	 */
	private IBaseDataSetDesign getDataSetDesign( DataRequestSession session,DataSetHandle dataSet,
			boolean useColumnHints, boolean useFilters ) throws BirtException
	{
		if ( dataSet != null )
		{
			return getDataSetDesign( dataSet, useColumnHints, useFilters, session );
		}
		return null;
	}
	
	/**
	 * @param dataSet
	 * @param useColumnHints
	 * @param useFilters
	 * @param session
	 * @return
	 * @throws BirtException
	 */
	private IBaseDataSetDesign getDataSetDesign( DataSetHandle dataSet, boolean useColumnHints, boolean useFilters, DataRequestSession session ) throws BirtException
	{
		IBaseDataSetDesign dataSetDesign = session.getModelAdaptor( )
				.adaptDataSet( dataSet );
		if ( !useColumnHints )
		{
			dataSetDesign.getResultSetHints( ).clear( );
		}
		if ( !useFilters )
		{