title: Hive GUDF custom unzip function test case failing with error "B cannot be cast to org.apache.hadoop.io.BytesWritable"
body: <p>I'm writing test case for Generic UDF custom unzip evaluate function which does unzipping of zip files. This jar is used in Hivequery.
  Here code for test case,</p>
  <pre><code>public void testEvaluate() throws HiveException, IOException {
      Unzip unzip = new Unzip();
      File resourcesDirectory = new File(&quot;src/test/resources/test.zip&quot;);
      byte[] bytes = Files.readAllBytes( resourcesDirectory.toPath() );
  
      ObjectInspector binaryOI = PrimitiveObjectInspectorFactory.writableBinaryObjectInspector;
      ObjectInspector[] arguments = {binaryOI};
      unzip.initialize(arguments);
  
      GenericUDF.DeferredObject valueObj0 = new GenericUDF.DeferredJavaObject(bytes);
      GenericUDF.DeferredObject[] args = { valueObj0 };
  
      unzip.evaluate(args  );}
  </code></pre>
  <p><strong>I'm getting error as below</strong>,</p>
  <pre><code>java.lang.ClassCastException: [B cannot be cast to org.apache.hadoop.io.BytesWritable
  
  at org.apache.hadoop.hive.serde2.objectinspector.primitive.WritableBinaryObjectInspector.getPrimitiveJavaObject(WritableBinaryObjectInspector.java:49)
  at Unzip.evaluate(Unzip.java:32)
  at UnzipTest.testEvaluate(UnzipTest.java:96)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
  at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
  at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
  at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
  at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
  at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
  at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
  at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
  </code></pre>
  <p><strong>The error is occuring at line when reading bytes from DeferredObject[] args,</strong></p>
  <pre><code> -  byte[] input = elementOI.getPrimitiveJavaObject( arg[0].get() );
  </code></pre>
  <p>PS: test.zip contains a text file(with test string) zipped to test.zip</p>