This patch allows the PL/Python module to do (SRF) functions.

The patch was taken from the CVS version.

I have modified the plpython.c file and have added a test sql script for
testing the functionality. It was actually the script that was in the
8.0.3 version but have since been removed.

In order to signal the end of a set, the called python function must
simply return plpy.EndOfSet and the set would be returned.

Gerrit van Dyk

Author: bmomjian

src/pl/plpython/plpython.c

@@ -29,7 +29,7 @@
  * MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  *
  * IDENTIFICATION
- *	$PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.62 2005/05/06 17:24:55 tgl Exp $
+ *	$PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.63 2005/07/04 18:59:42 momjian Exp $
  *
  *********************************************************************
  */
@@ -286,6 +286,9 @@ static PyObject *PLy_exc_error = NULL;
 static PyObject *PLy_exc_fatal = NULL;
 static PyObject *PLy_exc_spi_error = NULL;
 
+/* End-of-set Indication */
+static PyObject *PLy_endofset = NULL;
+
 /* some globals for the python module
  */
 static char PLy_plan_doc[] = {
@@ -770,6 +773,16 @@ PLy_function_handler(FunctionCallInfo fcinfo, PLyProcedure * proc)
 			fcinfo->isnull = true;
 			rv = (Datum) NULL;
 		}
+		/* test for end-of-set condition */
+		else if (fcinfo->flinfo->fn_retset && plrv == PLy_endofset)
+		{
+		   ReturnSetInfo *rsi;
+
+		   fcinfo->isnull = true;
+		   rv = (Datum)NULL;
+		   rsi = (ReturnSetInfo *)fcinfo->resultinfo;
+		   rsi->isDone = ExprEndResult;
+		}
 		else
 		{
 			fcinfo->isnull = false;
@@ -2317,9 +2330,11 @@ PLy_init_plpy(void)
 	PLy_exc_error = PyErr_NewException("plpy.Error", NULL, NULL);
 	PLy_exc_fatal = PyErr_NewException("plpy.Fatal", NULL, NULL);
 	PLy_exc_spi_error = PyErr_NewException("plpy.SPIError", NULL, NULL);
+	PLy_endofset = PyErr_NewException("plpy.EndOfSet",NULL,NULL);
 	PyDict_SetItemString(plpy_dict, "Error", PLy_exc_error);
 	PyDict_SetItemString(plpy_dict, "Fatal", PLy_exc_fatal);
 	PyDict_SetItemString(plpy_dict, "SPIError", PLy_exc_spi_error);
+	PyDict_SetItemString(plpy_dict, "EndOfSet", PLy_endofset);
 
 	/*
 	 * initialize main module, and add plpy

src/pl/plpython/sql/plpython_setof.sql

@@ -0,0 +1,12 @@
+
+CREATE or replace FUNCTION test_setof() returns setof text
+	AS
+'if GD.has_key("calls"):
+	GD["calls"] = GD["calls"] + 1
+	if GD["calls"] > 2:
+		del GD["calls"]
+		return plpy.EndOfSet
+else:
+	GD["calls"] = 1
+return str(GD["calls"])'
+	LANGUAGE plpythonu;