why citus does not support OCLASS_OPCLASS in supportedDependecnyByCitus function

recently, I use the bingo extension from https://github.com/epam/Indigo, which has the following definintion

```
CREATE OPERATOR CLASS bmolecule
FOR TYPE bytea USING bingo_idx
AS
OPERATOR 1 public.@ (bytea, sub),
OPERATOR 2 public.@ (bytea, exact),
OPERATOR 3 public.@ (bytea, smarts),
OPERATOR 4 public.@ (bytea, gross),
OPERATOR 5 public.< (bytea, mass),
OPERATOR 6 public.> (bytea, mass),
OPERATOR 7 public.@ (bytea, sim),
FUNCTION 1 matchSub(bytea, sub),
FUNCTION 2 matchExact(bytea, exact),
FUNCTION 3 matchSmarts(bytea, smarts),
FUNCTION 4 matchGross(bytea, gross),
FUNCTION 5 _match_mass_less(bytea, mass),
FUNCTION 6 _match_mass_great(bytea, mass),
FUNCTION 7 matchSim(bytea, sim);
```
,
the above-mentioned defininition is not supported in source file src/backend/distributed/meta/dependency.c
can someone tell me why such kind of class do not be supported?