GdauiDataStore strangeness

Makefile

all:
	sqlite3 test.db "CREATE TABLE IF NOT EXISTS test (id integer not null primary key, name varchar(20) not null)"
	sqlite3 test.db "DELETE FROM test"
	sqlite3 test.db "INSERT INTO test VALUES (1, 'a')"
	gcc -o test -Wall -g -O2 `pkg-config --cflags --libs gtk+-3.0 libgda-ui-5.0 libgda-sqlite-5.0` test.c

test.c

#include <sql-parser/gda-sql-parser.h>
#include <libgda-ui/libgda-ui.h>
#include <gtk/gtk.h>
#include <libgda/libgda.h>

int
main(int argc, char **argv)
{
    GdaConnection  *conn;
    GdaSqlParser   *parser;
    GdaStatement   *sth;
    GdaDataModel   *result;
    GdauiDataStore *store;
    gint           test_int;
    const gchar    *test_string;
    GtkTreeIter    iter;
    const GValue   *value;
    GError         *err = NULL;

    gtk_init(&argc, &argv);
    gda_init();

    if ((conn = gda_connection_open_from_string(
                 NULL,
                 "SQLite://DB_DIR=/home/polesz/gdaui-test;DB_NAME=test",
                 NULL,
                 GDA_CONNECTION_OPTIONS_NONE,
                 &err)) == NULL) {
        g_error("Open: %s", err->message);
    }

    parser = gda_connection_create_parser(conn);
    sth = gda_sql_parser_parse_string(
            parser,
            "SELECT id, name FROM test WHERE id = 1",
            NULL,
            NULL
        );
    result = gda_connection_statement_execute_select(conn, sth, NULL, &err);
    store = GDAUI_DATA_STORE(gdaui_data_store_new(result));

    if (gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter)) {
        gtk_tree_model_get(
                GTK_TREE_MODEL(store), &iter,
                0, &test_int,
                1, &test_string,
                -1);
        g_warning("ID: %d; name: '%s'", test_int, test_string);
    } else {
        g_error("No such row!");
    }

    value = gda_data_model_get_value_at(result, 0, 0, &err);
    test_int = g_value_get_int(value);

    value = gda_data_model_get_value_at(result, 1, 0, &err);
    test_string = g_value_get_string(value);

    g_warning("ID: %d; name: '%s'", test_int, test_string);

    return 0;
}