Add transforms feature

This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.

reviews by Pavel Stěhule and Andres Freund

1 files changed, 16 insertions, 5 deletions

diff --git a/src/pl/plpython/plpy_util.c b/src/pl/plpython/plpy_util.c
index 36958cb10f3..b6b92557678 100644
--- a/src/pl/plpython/plpy_util.c
+++ b/src/pl/plpython/plpy_util.c
@@ -142,19 +142,30 @@ PLyUnicode_AsString(PyObject *unicode)
  * unicode object.  Reference ownership is passed to the caller.
  */
 PyObject *
-PLyUnicode_FromString(const char *s)
+PLyUnicode_FromStringAndSize(const char *s, Py_ssize_t size)
 {
 	char	   *utf8string;
 	PyObject   *o;
 
-	utf8string = pg_server_to_any(s, strlen(s), PG_UTF8);
-
-	o = PyUnicode_FromString(utf8string);
+	utf8string = pg_server_to_any(s, size, PG_UTF8);
 
-	if (utf8string != s)
+	if (utf8string == s)
+	{
+		o = PyUnicode_FromStringAndSize(s, size);
+	}
+	else
+	{
+		o = PyUnicode_FromString(utf8string);
 		pfree(utf8string);
+	}
 
 	return o;
 }
 
+PyObject *
+PLyUnicode_FromString(const char *s)
+{
+	return PLyUnicode_FromStringAndSize(s, strlen(s));
+}
+
 #endif   /* PY_MAJOR_VERSION >= 3 */