Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5395#discussion_r28198701
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveInspectors.scala ---
@@ -213,8 +215,16 @@ private[hive] trait HiveInspectors {
case c: Class[_] if c.isArray =>
ArrayType(javaClassToDataType(c.getComponentType))
+ // list type
+ case c: Class[_] if c == classOf[java.util.List[java.lang.Object]] =>
+ logWarning("Failed to catch a correct component type in List<>
because of type erasure," +
+ " so you need to handle it correctly by yourself")
+ ArrayType(ErasedType)
+
// Hive seems to return this for struct types?
case c: Class[_] if c == classOf[java.lang.Object] => NullType
+
+ case c => throw new HiveDataTypeException("Unknown java type: " + c)
--- End diff --
Also prefer string interpolation to `+`, `s"Unknown UDF input type $c"`
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