Context:
With OPT-4004, the genric filter operators' string fields were replaced by a dedicated filter operator enum class. However, each filter operator support different operators and should, thus, have different enums to indicate which operators are allowed for that field. For example, the variable filter operator field allows all possible operators (such as >, <, >=, etc.), whereas the duration filter operator field only supports is and is not.

AT:

• there are dedicated enum classes for every filter operator field