[jira] [Assigned] (SPARK-25718) Detect recursive reference in Avro schema and throw exception

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-25718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-25718:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            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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