Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17188
We don't support circle reference in class hierarchy, so this case should
fail.
But this PR only checks if a field is same-type of the class, not for all
circles. e.g.
```
class A {
B b;
}
class B {
A a;
}
```
will still throw StackOverflowError
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