Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/18416
why not use `KryoEncoder` for `Set`? Serializing `Set` to catalyst array
loses the set property, and it just becomes a meaningless binary: most of the
array methods are meaningless, e.g. get element by index, get length, etc.
Regarding this, I don't see the point to make `Set` an array at catalyst level,
we can just make it a binary via the `KryoEncoder`.
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