diff options
Diffstat (limited to 'lib/sqlalchemy/sql.py')
| -rw-r--r-- | lib/sqlalchemy/sql.py | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/lib/sqlalchemy/sql.py b/lib/sqlalchemy/sql.py index f4ece3d6b..9c327bd53 100644 --- a/lib/sqlalchemy/sql.py +++ b/lib/sqlalchemy/sql.py @@ -1342,7 +1342,17 @@ class _CompareMixin(object): return obj.type class Selectable(ClauseElement): - """Represent a column list-holding object.""" + """Represent a column list-holding object. + + this is the common base class of [sqlalchemy.sql#ColumnElement] + and [sqlalchemy.sql#FromClause]. The reason ``ColumnElement`` + is marked as a "list-holding" object is so that it can be treated + similarly to ``FromClause`` in column-selection scenarios; it + contains a list of columns consisting of itself. + + """ + + columns = util.NotImplProperty("""a [sqlalchemy.sql#ColumnCollection] containing ``ColumnElement`` instances.""") def _selectable(self): return self @@ -2792,7 +2802,7 @@ class Select(_SelectBaseMixin, FromClause): def append_column(self, column): if _is_literal(column): - column = literal_column(str(column), table=self) + column = literal_column(str(column)) self._raw_columns.append(column) |