what kind of expression should be put in subscribe(self, topic, callback, expression='*')

I want to use SQL in expression to filter message properties when consuming messages, but it seems that I cannot get the messages I want.
I put "Tag=test AND creator=xx" in expression and I want to filter messages with tag test and property {creator=xx}. How should I get this done?

Start with the subscribe(self, topic, callback, expression='*') entry point and the expression shown in the issue. Compare the supported expression syntax with the requested tag and creator filters, then reproduce the behavior; done means identifying a valid expression or confirming a client limitation.

Rédigé par le modèle d'indexation à partir du texte de l'issue.