Bug 141950 Selection of select value in data set filter is error
Details: Selection of select value in data set filter is error Step: 1.New a report design. 2.Create a sample datasource and dataset. 3.Switch to filter. 4.Select a value in expression. 5.Drop the list of the value1 and select <select value...> Actual result: No value is appear and pop up an error. It said that "An expression has not been set"
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
* @param dataSet
	 * @param resultSet
	 * @throws BirtException
	 */
	private void saveResultToDataItems( DataSetHandle dataSet,
			IQueryResults resultSet ) throws BirtException
	{
		
		IResultMetaData metaData = resultSet.getResultMetaData( );
		
		int columnCount = 0;
		if ( metaData != null )
			columnCount = metaData.getColumnCount( );
		DataSetViewData[] columns = new DataSetViewData[columnCount];
		
		
		
		
		HashSet orgColumnNameSet = new HashSet( );
		
		HashSet uniqueColumnNameSet = new HashSet( );
		for ( int n = 0; n < columns.length; n++ )
		{
			orgColumnNameSet.add( metaData.getColumnName( n + 1 ) );
		}
		for ( int n = 0; n < columns.length; n++ )
		{
			columns[n] = new DataSetViewData( );
			columns[n].setParent( dataSet );
			columns[n].setDataType( metaData.getColumnType( n + 1 ) );