sql.py 文件源码

def _get_col_by_original(self, column):
        """given a column which is a schema.Column object attached to a schema.Table object
        (i.e. an "original" column), return the Column object from this 
        Selectable which corresponds to that original Column, or None if this Selectable
        does not contain the column."""
        return self.original_columns.get(column.original, None)