base.py 文件源码

def visit_alias(self, alias, asfrom=False, **kwargs):
        if self.dialect._version_two:
            return super(FBCompiler, self).\
                visit_alias(alias, asfrom=asfrom, **kwargs)
        else:
            # Override to not use the AS keyword which FB 1.5 does not like
            if asfrom:
                alias_name = isinstance(alias.name,
                                        expression._truncated_label) and \
                    self._truncated_identifier("alias",
                                               alias.name) or alias.name

                return self.process(
                    alias.original, asfrom=asfrom, **kwargs) + \
                    " " + \
                    self.preparer.format_alias(alias, alias_name)
            else:
                return self.process(alias.original, **kwargs)