- [feature] To complement [ticket:2547], types

can now provide "bind expressions" and
"column expressions" which allow compile-time
injection of SQL expressions into statements
on a per-column or per-bind level.   This is
to suit the use case of a type which needs
to augment bind- and result- behavior at the
SQL level, as opposed to in the Python level.
Allows for schemes like transparent encryption/
decryption, usage of Postgis functions, etc.
[ticket:1534]
- update postgis example fully.
- still need to repair the result map propagation
here to be transparent for cases like "labeled column".

1 files changed, 1 insertions, 4 deletions

diff --git a/lib/sqlalchemy/dialects/postgresql/base.py b/lib/sqlalchemy/dialects/postgresql/base.py
index 36da14d33..d159649e0 100644
--- a/lib/sqlalchemy/dialects/postgresql/base.py
+++ b/lib/sqlalchemy/dialects/postgresql/base.py
@@ -691,10 +691,7 @@ class PGCompiler(compiler.SQLCompiler):
     def returning_clause(self, stmt, returning_cols):
 
         columns = [
-                self.process(
-                    self.label_select_column(None, c, asfrom=False),
-                    within_columns_clause=True,
-                    result_map=self.result_map)
+                self._label_select_column(None, c, True, False, {})
                 for c in expression._select_iterables(returning_cols)
             ]