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diff --git a/common/polymorphism/test4.hxx b/common/polymorphism/test4.hxx
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+++ b/common/polymorphism/test4.hxx
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+// file      : common/polymorphism/test4.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST4_HXX
+#define TEST4_HXX
+
+#include <string>
+
+#include <odb/core.hxx>
+
+// Test views.
+//
+#pragma db namespace table("t4_")
+namespace test4
+{
+  #pragma db object polymorphic
+  struct root1
+  {
+    virtual ~root1 () {}
+    root1 () {}
+    root1 (unsigned long i): id (i) {}
+
+    #pragma db id
+    unsigned long id;
+  };
+
+  #pragma db object
+  struct base1: root1
+  {
+    base1 () {}
+    base1 (unsigned long i, unsigned long n): root1 (i), num (n) {}
+
+    unsigned long num;
+  };
+
+  #pragma db object polymorphic
+  struct root2
+  {
+    virtual ~root2 () {}
+    root2 () {}
+    root2 (unsigned long i, unsigned long n): id (i), num (n) {}
+
+    #pragma db id
+    unsigned long id;
+
+    unsigned long num;
+  };
+
+  #pragma db object
+  struct base2: root2
+  {
+    base2 () {}
+    base2 (unsigned long i, unsigned long n, const std::string& s)
+        : root2 (i, n), str (s) {}
+
+    std::string str;
+  };
+
+  // Test custom join condition.
+  //
+  #pragma db view object(base2) object(base1: base2::num == base1::num)
+  struct view1
+  {
+    std::string str;
+  };
+
+  #pragma db view object(base2)
+  struct view2
+  {
+    #pragma db column("min(" + base2::num + ")")
+    std::size_t min_num;
+  };
+}
+
+#endif // TEST4_HXX