Allow PL/Python functions to return void, per gripe from James Robinson

(I didn't use his patch, however). A void-returning PL/Python function
must return None (from Python), which is translated into a void datum
(and *not* NULL) for Postgres. I also added some regression tests for
this functionality.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/pl/plpython/sql/plpython_function.sql b/src/pl/plpython/sql/plpython_function.sql
index e3ec2afe014..7428a599eea 100644
--- a/src/pl/plpython/sql/plpython_function.sql
+++ b/src/pl/plpython/sql/plpython_function.sql
@@ -341,3 +341,18 @@ plan = plpy.prepare("SELECT $1 AS testvalue1, $2 AS testvalue2", ["text", "text"
 rv = plpy.execute(plan, u"\\x80", 1)
 return rv[0]["testvalue1"]
 ' LANGUAGE plpythonu;
+
+-- Tests for functions that return void
+
+CREATE FUNCTION test_void_func1() RETURNS void AS $$
+x = 10
+$$ LANGUAGE plpythonu;
+
+-- illegal: can't return non-None value in void-returning func
+CREATE FUNCTION test_void_func2() RETURNS void AS $$
+return 10
+$$ LANGUAGE plpythonu;
+
+CREATE FUNCTION test_return_none() RETURNS int AS $$
+None
+$$ LANGUAGE plpythonu;