PL/Python: Convert oid to long/int

oid is a numeric type, so transform it to the appropriate Python
numeric type like the other ones.

doc/src/sgml/plpython.sgml

@@ -302,7 +302,7 @@ $$ LANGUAGE plpythonu;
       <para>
        PostgreSQL <type>smallint</type> and <type>int</type> are
        converted to Python <type>int</type>.
-       PostgreSQL <type>bigint</type> is converted
+       PostgreSQL <type>bigint</type> and <type>oid</type> are converted
        to <type>long</type> in Python 2 and to <type>int</type> in
        Python 3.
       </para>

src/pl/plpython/expected/plpython_types.out

@@ -321,6 +321,34 @@ CONTEXT:  PL/Python function "test_type_conversion_float8"
                             
 (1 row)
 
+CREATE FUNCTION test_type_conversion_oid(x oid) RETURNS oid AS $$
+plpy.info(x, type(x))
+return x
+$$ LANGUAGE plpythonu;
+SELECT * FROM test_type_conversion_oid(100);
+INFO:  (100L, <type 'long'>)
+CONTEXT:  PL/Python function "test_type_conversion_oid"
+ test_type_conversion_oid 
+--------------------------
+                      100
+(1 row)
+
+SELECT * FROM test_type_conversion_oid(2147483649);
+INFO:  (2147483649L, <type 'long'>)
+CONTEXT:  PL/Python function "test_type_conversion_oid"
+ test_type_conversion_oid 
+--------------------------
+               2147483649
+(1 row)
+
+SELECT * FROM test_type_conversion_oid(null);
+INFO:  (None, <type 'NoneType'>)
+CONTEXT:  PL/Python function "test_type_conversion_oid"
+ test_type_conversion_oid 
+--------------------------
+                         
+(1 row)
+
 CREATE FUNCTION test_type_conversion_text(x text) RETURNS text AS $$
 plpy.info(x, type(x))
 return x

src/pl/plpython/expected/plpython_types_3.out

@@ -321,6 +321,34 @@ CONTEXT:  PL/Python function "test_type_conversion_float8"
                             
 (1 row)
 
+CREATE FUNCTION test_type_conversion_oid(x oid) RETURNS oid AS $$
+plpy.info(x, type(x))
+return x
+$$ LANGUAGE plpython3u;
+SELECT * FROM test_type_conversion_oid(100);
+INFO:  (100, <class 'int'>)
+CONTEXT:  PL/Python function "test_type_conversion_oid"
+ test_type_conversion_oid 
+--------------------------
+                      100
+(1 row)
+
+SELECT * FROM test_type_conversion_oid(2147483649);
+INFO:  (2147483649, <class 'int'>)
+CONTEXT:  PL/Python function "test_type_conversion_oid"
+ test_type_conversion_oid 
+--------------------------
+               2147483649
+(1 row)
+
+SELECT * FROM test_type_conversion_oid(null);
+INFO:  (None, <class 'NoneType'>)
+CONTEXT:  PL/Python function "test_type_conversion_oid"
+ test_type_conversion_oid 
+--------------------------
+                         
+(1 row)
+
 CREATE FUNCTION test_type_conversion_text(x text) RETURNS text AS $$
 plpy.info(x, type(x))
 return x

src/pl/plpython/plpy_typeio.c

@@ -39,6 +39,7 @@ static PyObject *PLyFloat_FromNumeric(PLyDatumToOb *arg, Datum d);
 static PyObject *PLyInt_FromInt16(PLyDatumToOb *arg, Datum d);
 static PyObject *PLyInt_FromInt32(PLyDatumToOb *arg, Datum d);
 static PyObject *PLyLong_FromInt64(PLyDatumToOb *arg, Datum d);
+static PyObject *PLyLong_FromOid(PLyDatumToOb *arg, Datum d);
 static PyObject *PLyBytes_FromBytea(PLyDatumToOb *arg, Datum d);
 static PyObject *PLyString_FromDatum(PLyDatumToOb *arg, Datum d);
 static PyObject *PLyList_FromArray(PLyDatumToOb *arg, Datum d);
@@ -460,6 +461,9 @@ PLy_input_datum_func2(PLyDatumToOb *arg, Oid typeOid, HeapTuple typeTup)
 		case INT8OID:
 			arg->func = PLyLong_FromInt64;
 			break;
+		case OIDOID:
+			arg->func = PLyLong_FromOid;
+			break;
 		case BYTEAOID:
 			arg->func = PLyBytes_FromBytea;
 			break;
@@ -546,6 +550,12 @@ PLyLong_FromInt64(PLyDatumToOb *arg, Datum d)
 		return PyLong_FromLong(DatumGetInt64(d));
 }
 
+static PyObject *
+PLyLong_FromOid(PLyDatumToOb *arg, Datum d)
+{
+	return PyLong_FromUnsignedLong(DatumGetObjectId(d));
+}
+
 static PyObject *
 PLyBytes_FromBytea(PLyDatumToOb *arg, Datum d)
 {

src/pl/plpython/sql/plpython_types.sql

@@ -119,6 +119,16 @@ SELECT * FROM test_type_conversion_float8(5000000000.5);
 SELECT * FROM test_type_conversion_float8(null);
 
 
+CREATE FUNCTION test_type_conversion_oid(x oid) RETURNS oid AS $$
+plpy.info(x, type(x))
+return x
+$$ LANGUAGE plpythonu;
+
+SELECT * FROM test_type_conversion_oid(100);
+SELECT * FROM test_type_conversion_oid(2147483649);
+SELECT * FROM test_type_conversion_oid(null);
+
+
 CREATE FUNCTION test_type_conversion_text(x text) RETURNS text AS $$
 plpy.info(x, type(x))
 return x