Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/17188#discussion_r105343821
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/JavaTypeInference.scala
---
@@ -69,7 +69,8 @@ object JavaTypeInference {
* @param typeToken Java type
* @return (SQL data type, nullable)
*/
- private def inferDataType(typeToken: TypeToken[_]): (DataType, Boolean)
= {
+ private def inferDataType(typeToken: TypeToken[_], seenTypeSet:
Set[Class[_]] = Set.empty)
--- End diff --
You mean this case?
```
scala> :paste
case class classA(i: Int, cls: classB)
case class classB(cls: classA)
scala> Seq(classA(0, null)).toDS()
java.lang.StackOverflowError
at scala.reflect.internal.Symbols$Symbol.info(Symbols.scala:1494)
at
scala.reflect.runtime.JavaMirrors$JavaMirror$$anon$1.scala$reflect$runtime$SynchronizedSymbols$SynchronizedSymbol$$super$info(JavaMirrors.scala:66)
at
scala.reflect.runtime.SynchronizedSymbols$SynchronizedSymbol$$anonfun$info$1.apply(SynchronizedSymbols.scala:127)
at
scala.reflect.runtime.SynchronizedSymbols$SynchronizedSymbol$$anonfun$info$1.apply(SynchronizedSymbols.scala:127)
at scala.reflect.runtime.Gil$class.gilSynchronized(Gil.scala:19)
at
scala.reflect.runtime.JavaUniverse.gilSynchronized(JavaUniverse.scala:16)
at
scala.reflect.runtime.SynchronizedSymbols$SynchronizedSymbol$class.gilSynchronizedIfNotThreadsafe(SynchronizedSymbols.scala:123)
at
scala.reflect.runtime.JavaMirrors$JavaMirror$$anon$1.gilSynchronizedIfNotThreadsafe(JavaMirrors.scala:66)
at
scala.reflect.runtime.SynchronizedSymbols$SynchronizedSymbol$class.info(SynchronizedSymbols.scala:127)
at
scala.reflect.runtime.JavaMirrors$JavaMirror$$anon$1.info(JavaMirrors.scala:66)
at
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:48)
at
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
at
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
at
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
at
scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:45)
```
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