Github user huaxingao commented on the issue:
https://github.com/apache/spark/pull/13287
@gatorsmile
Sorry for the late response. I just came back from China.
For a class that has two level of constructor parameters, e.g.
private[sql] case class JDBCRelation(
url: String,
table: String,
parts: Array[Partition],
properties: Properties = new Properties())(@transient val sparkSession:
SparkSession)
toJson will have problem. The current code doesn't have problem any more
because in the new method TreeNode.shouldConvertToJson, JDBCRelation returns
false and is not allowed to convert to JSON. However, it seems to me that the
root problem is not fixed. In the following cases:
1. TreeNode that has two layers of constructor parameters.
2. TreeNode has a constructor parameter that contains two layers of
constructor parameters.
And if the TreeNode can be converted to JSON, the Exception will still
occur.
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