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diff --git a/common/polymorphism/test3.hxx b/common/polymorphism/test3.hxx
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+// file      : common/polymorphism/test3.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST3_HXX
+#define TEST3_HXX
+
+#include <string>
+#include <typeinfo>
+
+#include <odb/core.hxx>
+
+// Test delayed loading.
+//
+#pragma db namespace table("t3_")
+namespace test3
+{
+  #pragma db object polymorphic
+  struct root
+  {
+    virtual ~root () {}
+    root () {}
+    root (unsigned long i): id (i) {}
+
+    #pragma db id
+    unsigned long id;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (root))
+        return false;
+
+      return id == r.id;
+    }
+  };
+
+  inline bool
+  operator== (const root& x, const root& y) {return x.compare (y);}
+
+  #pragma db object
+  struct base: root
+  {
+    virtual ~base () {delete rptr;}
+    base (): rptr (0) {}
+    base (unsigned long i, unsigned long n): root (i), num (n), rptr (0) {}
+
+    unsigned long num;
+    root* rptr;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (base))
+        return false;
+
+      const base& b (static_cast<const base&> (r));
+      return
+        root::compare (r, false) &&
+        num == b.num &&
+        ((rptr == 0 && b.rptr == 0) || rptr->compare (*b.rptr));
+    }
+  };
+
+  #pragma db object
+  struct derived: base
+  {
+    virtual ~derived () {delete bptr;}
+    derived (): bptr (0) {}
+    derived (unsigned long i, unsigned long n, const std::string& s)
+        : base (i, n), str (s), bptr (0) {}
+
+    std::string str;
+    base* bptr;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (derived))
+        return false;
+
+      const derived& d (static_cast<const derived&> (r));
+      return
+        base::compare (r, false) &&
+        str == d.str &&
+        ((bptr == 0 && d.bptr == 0) || bptr->compare (*d.bptr));
+    }
+  };
+
+  // Views.
+  //
+  #pragma db view object(base) object(root = r)
+  struct base_view
+  {
+    #pragma db column(base::id)
+    unsigned long b_id;
+
+    #pragma db column(r::id)
+    unsigned long r_id;
+
+    unsigned long num;
+  };
+
+  #pragma db view                               \
+    object(derived = d)                         \
+    object(base = b)                            \
+    object(root = r: d::rptr)
+  struct derived_view
+  {
+    #pragma db column(d::id)
+    unsigned long d_id;
+
+    #pragma db column(b::id)
+    unsigned long b_id;
+
+    #pragma db column(r::id)
+    unsigned long r_id;
+
+    #pragma db column(d::num)
+    unsigned long d_num;
+
+    #pragma db column(b::num)
+    unsigned long b_num;
+
+    std::string str;
+  };
+
+  // This is an example of a pathological case, where the right-hand-side
+  // of the join condition comes from one of the bases. As a result, we
+  // join the base table first, which means we will get both bases and
+  // derived objects instead of just derived.
+  //
+  //#pragma db view object(root = r) object(derived = d)
+  #pragma db view object(derived = d) object(root = r)
+  struct root_view
+  {
+    #pragma db column(r::id)
+    unsigned long r_id;
+
+    #pragma db column(d::id)
+    unsigned long d_id;
+
+    std::string str;
+  };
+}
+
+#endif // TEST3_HXX