Maximiliano Robaina avatar Maximiliano Robaina committed 68ced70

Implement rename_column. Modify delete_column_string.

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     alter_string_set_default =  'ALTER %(column)s SET DEFAULT %(default)s;'
     alter_string_drop_null = ''
     add_column_string = 'ALTER TABLE %s ADD %s;'
+    delete_column_string = 'ALTER TABLE %s DROP %s;'
     allows_combined_alters = False
     def _fill_constraint_cache(self, db_name, table_name):
+    @generic.copy_column_constraints
+    @generic.delete_column_constraints
+    def rename_column(self, table_name, old, new):
+        if old == new:
+            # Short-circuit out
+            return []
+        self.execute('ALTER TABLE %s ALTER %s TO %s;' % (
+            self.quote_name(table_name),
+            self.quote_name(old),
+            self.quote_name(new),
+        ))
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