- [bug] Postgresql dialect memoizes that an ENUM of a

particular name was processed
during a create/drop sequence.  This allows
a create/drop sequence to work without any
calls to "checkfirst", and also means with
"checkfirst" turned on it only needs to
check for the ENUM once.  [ticket:2311]

1 files changed, 20 insertions, 16 deletions

diff --git a/lib/sqlalchemy/events.py b/lib/sqlalchemy/events.py
index f7de851cc..eee2a7557 100644
--- a/lib/sqlalchemy/events.py
+++ b/lib/sqlalchemy/events.py
@@ -78,10 +78,11 @@ class DDLEvents(event.Events):
         :param connection: the :class:`.Connection` where the
          CREATE statement or statements will be emitted.
         :param \**kw: additional keyword arguments relevant
-         to the event.  Currently this includes the ``tables``
-         argument in the case of a :class:`.MetaData` object,
-         which is the list of :class:`.Table` objects for which
-         CREATE will be emitted.
+         to the event.  The contents of this dictionary
+         may vary across releases, and include the
+         list of tables being generated for a metadata-level
+         event, the checkfirst flag, and other 
+         elements used by internal events.
 
         """
 
@@ -93,10 +94,11 @@ class DDLEvents(event.Events):
         :param connection: the :class:`.Connection` where the
          CREATE statement or statements have been emitted.
         :param \**kw: additional keyword arguments relevant
-         to the event.  Currently this includes the ``tables``
-         argument in the case of a :class:`.MetaData` object,
-         which is the list of :class:`.Table` objects for which
-         CREATE has been emitted.
+         to the event.  The contents of this dictionary
+         may vary across releases, and include the
+         list of tables being generated for a metadata-level
+         event, the checkfirst flag, and other 
+         elements used by internal events.
 
         """
 
@@ -108,10 +110,11 @@ class DDLEvents(event.Events):
         :param connection: the :class:`.Connection` where the
          DROP statement or statements will be emitted.
         :param \**kw: additional keyword arguments relevant
-         to the event.  Currently this includes the ``tables``
-         argument in the case of a :class:`.MetaData` object,
-         which is the list of :class:`.Table` objects for which
-         DROP will be emitted.
+         to the event.  The contents of this dictionary
+         may vary across releases, and include the
+         list of tables being generated for a metadata-level
+         event, the checkfirst flag, and other 
+         elements used by internal events.
 
         """
 
@@ -123,10 +126,11 @@ class DDLEvents(event.Events):
         :param connection: the :class:`.Connection` where the
          DROP statement or statements have been emitted.
         :param \**kw: additional keyword arguments relevant
-         to the event.  Currently this includes the ``tables``
-         argument in the case of a :class:`.MetaData` object,
-         which is the list of :class:`.Table` objects for which
-         DROP has been emitted.
+         to the event.  The contents of this dictionary
+         may vary across releases, and include the
+         list of tables being generated for a metadata-level
+         event, the checkfirst flag, and other 
+         elements used by internal events.
 
         """