Fix plpython to work (or at least pass its regression tests) with

python 2.5.  This involves fixing several violations of the published
spec for creating PyTypeObjects, and adding another regression test
expected output for yet another variation of error message spelling.

src/pl/plpython/expected/plpython_error_3.out

@@ -0,0 +1,38 @@
+-- test error handling, i forgot to restore Warn_restart in
+-- the trigger handler once. the errors and subsequent core dump were
+-- interesting.
+SELECT invalid_type_uncaught('rick');
+WARNING:  plpython: in function invalid_type_uncaught:
+DETAIL:  <class 'plpy.SPIError'>: Unknown error in PLy_spi_prepare
+ERROR:  type "test" does not exist
+SELECT invalid_type_caught('rick');
+WARNING:  plpython: in function invalid_type_caught:
+DETAIL:  <class 'plpy.SPIError'>: Unknown error in PLy_spi_prepare
+ERROR:  type "test" does not exist
+SELECT invalid_type_reraised('rick');
+WARNING:  plpython: in function invalid_type_reraised:
+DETAIL:  <class 'plpy.SPIError'>: Unknown error in PLy_spi_prepare
+ERROR:  type "test" does not exist
+SELECT valid_type('rick');
+ valid_type 
+------------
+ 
+(1 row)
+
+--
+-- Test Unicode error handling.
+--
+SELECT unicode_return_error();
+ERROR:  plpython: function "unicode_return_error" could not create return value
+DETAIL:  <type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode character u'\x80' in position 0: ordinal not in range(128)
+INSERT INTO unicode_test (testvalue) VALUES ('test');
+ERROR:  plpython: function "unicode_trigger_error" could not modify tuple
+DETAIL:  <type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode character u'\x80' in position 0: ordinal not in range(128)
+SELECT unicode_plan_error1();
+WARNING:  plpython: in function unicode_plan_error1:
+DETAIL:  <class 'plpy.Error'>: Unknown error in PLy_spi_execute_plan
+ERROR:  plpython: function "unicode_plan_error1" could not execute plan
+DETAIL:  <type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode character u'\x80' in position 0: ordinal not in range(128)
+SELECT unicode_plan_error2();
+ERROR:  plpython: function "unicode_plan_error2" could not execute plan
+DETAIL:  <type 'exceptions.UnicodeEncodeError'>: 'ascii' codec can't encode character u'\x80' in position 0: ordinal not in range(128)

src/pl/plpython/plpython.c

@@ -1,7 +1,7 @@
 /**********************************************************************
  * plpython.c - python as a procedural language for PostgreSQL
  *
- *	$PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.89 2006/10/04 00:30:14 momjian Exp $
+ *	$PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.90 2006/11/21 21:51:05 tgl Exp $
  *
  *********************************************************************
  */
@@ -1981,7 +1981,7 @@ static PyTypeObject PLy_PlanType = {
 	0,							/* tp_getattro */
 	0,							/* tp_setattro */
 	0,							/* tp_as_buffer */
-	0,							/* tp_xxx4 */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,	/* tp_flags */
 	PLy_plan_doc,				/* tp_doc */
 };
 
@@ -2026,7 +2026,7 @@ static PyTypeObject PLy_ResultType = {
 	0,							/* tp_getattro */
 	0,							/* tp_setattro */
 	0,							/* tp_as_buffer */
-	0,							/* tp_xxx4 */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,	/* tp_flags */
 	PLy_result_doc,				/* tp_doc */
 };
 
@@ -2098,7 +2098,7 @@ PLy_plan_dealloc(PyObject * arg)
 		PLy_free(ob->args);
 	}
 
-	PyMem_DEL(arg);
+	arg->ob_type->tp_free(arg);
 }
 
 
@@ -2152,7 +2152,7 @@ PLy_result_dealloc(PyObject * arg)
 	Py_XDECREF(ob->rows);
 	Py_XDECREF(ob->status);
 
-	PyMem_DEL(ob);
+	arg->ob_type->tp_free(arg);
 }
 
 static PyObject *
@@ -2701,7 +2701,11 @@ PLy_init_plpy(void)
 	/*
 	 * initialize plpy module
 	 */
-	PLy_PlanType.ob_type = PLy_ResultType.ob_type = &PyType_Type;
+	if (PyType_Ready(&PLy_PlanType) < 0)
+		elog(ERROR, "could not init PLy_PlanType");
+	if (PyType_Ready(&PLy_ResultType) < 0)
+		elog(ERROR, "could not init PLy_ResultType");
+
 	plpy = Py_InitModule("plpy", PLy_methods);
 	plpy_dict = PyModule_GetDict(plpy);