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https://issues.apache.org/jira/browse/SPARK-25718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648021#comment-16648021
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Apache Spark commented on SPARK-25718:
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User 'gengliangwang' has created a pull request for this issue:
https://github.com/apache/spark/pull/22709
> Detect recursive reference in Avro schema and throw exception
> -------------------------------------------------------------
>
> Key: SPARK-25718
> URL: https://issues.apache.org/jira/browse/SPARK-25718
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Gengliang Wang
> Priority: Major
>
> Avro schema allows recursive reference, e.g. the example schema in
> https://avro.apache.org/docs/1.8.2/spec.html#schema_record
> ```
> {
> "type": "record",
> "name": "LongList",
> "aliases": ["LinkedLongs"], // old name for this
> "fields" : [
> {"name": "value", "type": "long"}, // each element has a long
> {"name": "next", "type": ["null", "LongList"]} // optional next element
> ]
> }
> ```
> However, it is impossible to convert the schema as `StructType` in current
> Spark SQL. Running `SchemaConverters.toSqlType(avroSchema: Schema)` and we
> will get stack overflow exception.
> We should detect the recursive reference and throw exception for it.
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