diff options
Diffstat (limited to 'lib/sqlalchemy/sql/expression.py')
| -rw-r--r-- | lib/sqlalchemy/sql/expression.py | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py index 440c11833..9ac5c1d66 100644 --- a/lib/sqlalchemy/sql/expression.py +++ b/lib/sqlalchemy/sql/expression.py @@ -1037,6 +1037,18 @@ class ClauseElement(Visitable): return c + @property + def _constructor(self): + """return the 'constructor' for this ClauseElement. + + This is for the purposes for creating a new object of + this type. Usually, its just the element's __class__. + However, the "Annotated" version of the object overrides + to return the class of its proxied element. + + """ + return self.__class__ + @util.memoized_property def _cloned_set(self): """Return the set consisting all cloned anscestors of this @@ -3244,7 +3256,7 @@ class ColumnClause(_Immutable, ColumnElement): # propagate the "is_literal" flag only if we are keeping our name, # otherwise its considered to be a label is_literal = self.is_literal and (name is None or name == self.name) - c = ColumnClause( + c = self._constructor( name or self.name, selectable=selectable, type_=self.type, |