functions.py 文件源码

def alias(self, name=None, flat=False):
        """Produce a :class:`.Alias` construct against this
        :class:`.FunctionElement`.

        This construct wraps the function in a named alias which
        is suitable for the FROM clause.

        e.g.::

            from sqlalchemy.sql import column

            stmt = select([column('data')]).select_from(
                func.unnest(Table.data).alias('data_view')
            )

        Would produce:

        .. sourcecode:: sql

            SELECT data
            FROM unnest(sometable.data) AS data_view

        .. versionadded:: 0.9.8 The :meth:`.FunctionElement.alias` method
           is now supported.  Previously, this method's behavior was
           undefined and did not behave consistently across versions.

        """

        return Alias(self, name)