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diff --git a/pgsql/custom/query.hxx b/pgsql/custom/query.hxx
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+++ b/pgsql/custom/query.hxx
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+// file      : pgsql/custom/query.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef QUERY_HXX
+#define QUERY_HXX
+
+#include <string>
+
+#include <odb/pgsql/query.hxx>
+
+#include "test.hxx" // point
+
+namespace odb
+{
+  namespace pgsql
+  {
+    template <>
+    struct query_column<point, id_string>
+    {
+    private:
+      const char* table_;
+      const char* column_;
+      const char* conversion_;
+
+      std::string x_column_;
+      std::string y_column_;
+
+      // Sub-columns for individual members.
+      //
+    public:
+      query_column<double, id_double> x, y;
+
+      // is_null, is_not_null
+      //
+    public:
+      query
+      is_null () const
+      {
+        query q (table_, column_);
+        q += "IS NULL";
+        return q;
+      }
+
+      query
+      is_not_null () const
+      {
+        query q (table_, column_);
+        q += "IS NOT NULL";
+        return q;
+      }
+
+      // =
+      //
+    public:
+      query
+      equal (const point& v) const
+      {
+        return equal (val_bind<point> (v));
+      }
+
+      query
+      equal (val_bind<point> v) const
+      {
+        query q (table_, column_);
+        q += "~=";
+        q.append<point, id_string> (v, conversion_);
+        return q;
+      }
+
+      query
+      equal (ref_bind<point> r) const
+      {
+        query q (table_, column_);
+        q += "~=";
+        q.append<point, id_string> (r, conversion_);
+        return q;
+      }
+
+      friend query
+      operator== (const query_column& c, const point& v)
+      {
+        return c.equal (v);
+      }
+
+      friend query
+      operator== (const point& v, const query_column& c)
+      {
+        return c.equal (v);
+      }
+
+      friend query
+      operator== (const query_column& c, val_bind<point> v)
+      {
+        return c.equal (v);
+      }
+
+      friend query
+      operator== (val_bind<point> v, const query_column& c)
+      {
+        return c.equal (v);
+      }
+
+      friend query
+      operator== (const query_column& c, ref_bind<point> r)
+      {
+        return c.equal (r);
+      }
+
+      friend query
+      operator== (ref_bind<point> r, const query_column& c)
+      {
+        return c.equal (r);
+      }
+
+      // Column comparison.
+      //
+    public:
+      query
+      operator== (const query_column<point, id_string>& c) const
+      {
+        query q (table_, column_);
+        q += "~=";
+        q.append (c.table (), c.column ());
+        return q;
+      }
+
+    public:
+      query_column (const char* table, const char* column, const char* conv)
+          : table_ (table), column_ (column), conversion_ (conv),
+            x_column_ (std::string (column) + "[0]"),
+            y_column_ (std::string (column) + "[1]"),
+            x (table, x_column_.c_str (), 0),
+            y (table, y_column_.c_str (), 0)
+      {
+      }
+
+      const char*
+      table () const
+      {
+        return table_;
+      }
+
+      const char*
+      column () const
+      {
+        return column_;
+      }
+
+      const char*
+      conversion () const
+      {
+        return conversion_;
+      }
+    };
+  }
+}
+
+#endif // QUERY_HXX