gistfile1.js

appendFilenameColumn : function(anonDatasetDescriptor, id, index) {
        var datasetDescriptor = anonDatasetDescriptor.copy(id);

        var colArray = Ext.Array.clone(datasetDescriptor.get('columns'));
        if (index != null) {
            colArray = Ext.Array.insert(colArray, index,  [{ name : 'filename', title : 'Filename', type : Insight.util.Util.wrapWithDataTooltip }]);
        } else {
            colArray = Ext.Array.merge( colArray, [{ name : 'filename', title : 'Filename', type : Insight.util.Util.wrapWithDataTooltip }] );
        }
        datasetDescriptor.set('columns', colArray );
        datasetDescriptor.set('sorters', Ext.Array.merge( Ext.Array.clone(datasetDescriptor.get('sorters')), [{ property: 'filename', direction : 'ASC'}] ));

        return datasetDescriptor;
},