In IoT and crowd selection scenarios, complex CEP expressions are difficult for users to flexibly configure. Therefore, a simplified set of conditional expressions is needed to express CEP operators. This feature change aims to provide a convenient way to implement flexible and configurable expressions by configuring conditional expressions. I translated the syntax parsing logic from DSL to CEP operators using Anltr4 syntax.
design: https://docs.google.com/document/d/1zWiEzdXuLSCpfgME3rO98r5i7f6sepSSE61NxoY6r38/edit?usp=sharing
