Support INOUT arguments in procedures

In a top-level CALL, the values of INOUT arguments will be returned as a
result row.  In PL/pgSQL, the values are assigned back to the input
arguments.  In other languages, the same convention as for return a
record from a function is used.  That does not require any code changes
in the PL implementations.

Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/pl/plpython/sql/plpython_call.sql b/src/pl/plpython/sql/plpython_call.sql
index 3fb74de5f07..2f792f92bd7 100644
--- a/src/pl/plpython/sql/plpython_call.sql
+++ b/src/pl/plpython/sql/plpython_call.sql
@@ -34,6 +34,26 @@ CALL test_proc3(55);
 SELECT * FROM test1;
 
 
+-- output arguments
+
+CREATE PROCEDURE test_proc5(INOUT a text)
+LANGUAGE plpythonu
+AS $$
+return [a + '+' + a]
+$$;
+
+CALL test_proc5('abc');
+
+
+CREATE PROCEDURE test_proc6(a int, INOUT b int, INOUT c int)
+LANGUAGE plpythonu
+AS $$
+return (b * a, c * a)
+$$;
+
+CALL test_proc6(2, 3, 4);
+
+
 DROP PROCEDURE test_proc1;
 DROP PROCEDURE test_proc2;
 DROP PROCEDURE test_proc3;