Github user marmbrus commented on a diff in the pull request:

    https://github.com/apache/spark/pull/5395#discussion_r28198699
  
    --- 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")
    --- End diff --
    
    Maybe specify how they would handle it?


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