queries.py 文件源码

def evaluate(self, query: MutableMapping[str, Any], context: PipelineContext = None) -> bool:
        has_key = self.key in query
        if self.required and not has_key:
            raise MissingKeyError("{key} must be in query!".format(key=self.key))
        if self.child:
            self.child.evaluate(query, context)
        return has_key