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-rw-r--r--lib/sqlalchemy/sql/type_api.py6
1 files changed, 1 insertions, 5 deletions
diff --git a/lib/sqlalchemy/sql/type_api.py b/lib/sqlalchemy/sql/type_api.py
index 59e0f18dd..462a8763b 100644
--- a/lib/sqlalchemy/sql/type_api.py
+++ b/lib/sqlalchemy/sql/type_api.py
@@ -1082,8 +1082,7 @@ class TypeDecorator(SchemaEventTarget, TypeEngine):
In most cases this returns a dialect-adapted form of
the :class:`.TypeEngine` type represented by ``self.impl``.
- Makes usage of :meth:`dialect_impl` but also traverses
- into wrapped :class:`.TypeDecorator` instances.
+ Makes usage of :meth:`dialect_impl`.
Behavior can be customized here by overriding
:meth:`load_dialect_impl`.
@@ -1091,8 +1090,6 @@ class TypeDecorator(SchemaEventTarget, TypeEngine):
adapted = dialect.type_descriptor(self)
if not isinstance(adapted, type(self)):
return adapted
- elif isinstance(self.impl, TypeDecorator):
- return self.impl.type_engine(dialect)
else:
return self.load_dialect_impl(dialect)
@@ -1117,7 +1114,6 @@ class TypeDecorator(SchemaEventTarget, TypeEngine):
method.
"""
-
# some dialects have a lookup for a TypeDecorator subclass directly.
# postgresql.INTERVAL being the main example
typ = self.dialect_impl(dialect)