jacklzg created SPARK-33598:
-------------------------------
Summary: Support Java Class with circular references
Key: SPARK-33598
URL: https://issues.apache.org/jira/browse/SPARK-33598
Project: Spark
Issue Type: Improvement
Components: Java API
Affects Versions: 2.4.7
Reporter: jacklzg
If the target Java data class has a circular reference, Spark will fail fast
from creating the Dataset or running Encoders.
For example, with protobuf class, there is a reference with Descriptor, there
is no way to build a dataset from the protobuf class.
>From this line
```
Encoders.bean(ProtoBuffOuterClass.ProtoBuff.class);
```
It will throw out immediately
```
Exception in thread "main" java.lang.UnsupportedOperationException: Cannot have
circular references in bean class, but got the circular reference of class
class com.google.protobuf.Descriptors$Descriptor
```
Can we add a parameter, for example,
```
Encoders.bean(Class<T> clas, List<Fields> fieldsToIgnore);
````
or
```
Encoders.bean(Class<T> clas, boolean skipCircularRefField);
````
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