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https://issues.apache.org/jira/browse/SPARK-33598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17412560#comment-17412560
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Leonardo Neuwald commented on SPARK-33598:
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Hi [~hyukjin.kwon] [~jacklzg].
I tested with Spark 3.1.2 and it still happening. I can share an example or try
to fix if you are interested.
Thank you!
> 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
> Priority: Minor
>
> 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
> {color:#7a869a}Encoders.bean(ProtoBuffOuterClass.ProtoBuff.class);{color}
>
> It will throw out immediately
>
> {quote}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
> {quote}
>
> Can we add a parameter, for example,
>
> {code:java}
> Encoders.bean(Class<T> clas, List<Fields> fieldsToIgnore);{code}
> ````
> or
>
> {code:java}
> Encoders.bean(Class<T> clas, boolean skipCircularRefField);{code}
>
> which subsequently, instead of throwing an exception @
> [https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala#L556],
> it instead skip the field.
>
> {code:java}
> if (seenTypeSet.contains(t)) {
> if(skipCircularRefField)
> println("field skipped") //just skip this field
> else throw new UnsupportedOperationException( s"cannot have circular
> references in class, but got the circular reference of class $t")
> }
> {code}
>
>
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