Benyi Wang created SPARK-6589:
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Summary: SQLUserDefinedType failed in spark-shell
Key: SPARK-6589
URL: https://issues.apache.org/jira/browse/SPARK-6589
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.2.0
Environment: CDH 5.3.2
Reporter: Benyi Wang
{{DataType.fromJson}} will fail in spark-shell if the schema includes "udt". It
works if running in an application.
This causes that I cannot read a parquet file including a UDT field.
{{DataType.fromCaseClass}} does not support UDT.
I can load the class which shows that my UDT is in the classpath.
{code}
scala> Class.forName("com.bwang.MyTestUDT")
res6: Class[_] = class com.bwang.MyTestUDT
{code}
But DataType fails:
{code}
scala> DataType.fromJson(json)
java.lang.ClassNotFoundException: com.bwang.MyTestUDT
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at
org.apache.spark.sql.catalyst.types.DataType$.parseDataType(dataTypes.scala:77)
{code}
The reason is DataType.fromJson tries to load {{udtClass}} using this code:
{code}
case JSortedObject(
("class", JString(udtClass)),
("pyClass", _),
("sqlType", _),
("type", JString("udt"))) =>
Class.forName(udtClass).newInstance().asInstanceOf[UserDefinedType[_]]
}
{code}
Unfortunately, my UDT is loaded by {{SparkIMain$TranslatingClassLoader}}, but
DataType is loaded by {{Launcher$AppClassLoader}}.
{code}
scala> DataType.getClass.getClassLoader
res2: ClassLoader = sun.misc.Launcher$AppClassLoader@6876fb1b
scala> this.getClass.getClassLoader
res3: ClassLoader =
org.apache.spark.repl.SparkIMain$TranslatingClassLoader@63d36b29
{code}
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