ArcMap 10.1, the identify tool does not show feature attributes on a query layer on a PostgreSQL database. Why?

I’m developing an ArcGIS 10.1 desktop map editing application using ArcEngine and ArcObjects. I’m using a PostgreSQL database. After a direct database connection (using a query layer), I displayed the map. My problem is, the identify tool doesn’t really identify the features and their attributes (= It doesn’t display the attribute values) Please, look the situation here, pictorially. Has any one encountered such a problem or has an idea about it? Please give me anything (as a hint) that you think would solve my problem.So much thanks.
Here is the code:

public void GetMapData()
    {
        workspace = GetWorkspace();
        try
        {
            mapQuery = "select * from public.t_parcel";
            sqlWS = (ISqlWorkspace) workspace;

            queryDescription = sqlWS.GetQueryDescription(mapQuery);

            string uniqueNameInTheWorkspace = "";
            sqlWS.CheckDatasetName(mapQuery, queryDescription, out uniqueNameInTheWorkspace);
            ITable queryClass = sqlWS.OpenQueryClass(uniqueNameInTheWorkspace, queryDescription);
            var queryFClass = (IFeatureClass) queryClass;
            parcelFeatureLayer.FeatureClass = queryFClass;

            rgbColor = new RgbColor {Red = 229, Green = 229, Blue = 199};
            simpleLineSymbol = new SimpleLineSymbol {Width = 2, Color = rgbColor};
            simpleFillSymbol = new SimpleFillSymbol {Color = rgbColor, Outline = simpleLineSymbol};
            pSimpleRenderer = new SimpleRenderer {Symbol = (ISymbol) simpleFillSymbol};
            var geoFeatureLayer = (IGeoFeatureLayer) parcelFeatureLayer;

            geoFeatureLayer.Renderer = (IFeatureRenderer) pSimpleRenderer;
            // Add the layer to the map control
            parcelFeatureLayer.Name = "Layer";

            axMapControl1.AddLayer(parcelFeatureLayer);
            axMapControl1.Extent = axMapControl1.FullExtent;
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }
    }

 public IWorkspace GetWorkspace()
    {
        // Create the connection properties.

        IPropertySet connectionProps = new PropertySetClass();
        connectionProps.SetProperty("serverinstance", "172.20.0.71,5432");
        connectionProps.SetProperty("dbclient", "postgreSql");
        connectionProps.SetProperty("database", "geojson");
        connectionProps.SetProperty("authentication_mode", "DBMS");
        connectionProps.SetProperty("user", "postgres");
        connectionProps.SetProperty("password", "123456");

        // Create the workspace factory.

        Type factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.SqlWorkspaceFactory");
        var workspaceFactory = (IWorkspaceFactory) Activator.CreateInstance(factoryType);


        try
        {
            workspace = workspaceFactory.Open(connectionProps, 0);
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message.ToString());
        }

        return workspace;
    }