- The :class:`.CreateColumn` construct can be appled to a custom

compilation rule which allows skipping of columns, by producing
a rule that returns ``None``.  Also in 0.8.3.

1 files changed, 5 insertions, 3 deletions

diff --git a/lib/sqlalchemy/sql/compiler.py b/lib/sqlalchemy/sql/compiler.py
index dc3d55039..c56ca1ae4 100644
--- a/lib/sqlalchemy/sql/compiler.py
+++ b/lib/sqlalchemy/sql/compiler.py
@@ -2178,11 +2178,13 @@ class DDLCompiler(Compiled):
         for create_column in create.columns:
             column = create_column.element
             try:
-                text += separator
-                separator = ", \n"
-                text += "\t" + self.process(create_column,
+                processed = self.process(create_column,
                                     first_pk=column.primary_key
                                     and not first_pk)
+                if processed is not None:
+                    text += separator
+                    separator = ", \n"
+                    text += "\t" + processed
                 if column.primary_key:
                     first_pk = True
             except exc.CompileError as ce: