Function enum_function_value_with_state 

pub fn enum_function_value_with_state(
    catalog: Option<&dyn EnumLabelCatalog>,
    operation: EnumFunctionOperation,
    type_oid: u32,
    arguments: &[Value],
    state: Option<&EnumComparisonState>,
) -> Result<Value>

Evaluate with the calling expression’s retained comparison state. Equality, hashes and type-only operations do not initialize or inspect that state.