Description
TestStorages.testNullHandlingTypesWithProjection occasionally fail like below.
testNullHandlingTypesWithProjection[3](org.apache.tajo.storage.TestStorages) Time elapsed: 0.036 sec <<< ERROR! org.apache.parquet.schema.InvalidSchemaException: A group type can not be empty. Parquet does not support empty group without leaves. Empty group: table_schema at org.apache.parquet.schema.GroupType.<init>(GroupType.java:92) at org.apache.parquet.schema.GroupType.<init>(GroupType.java:48) at org.apache.parquet.schema.MessageType.<init>(MessageType.java:50) at org.apache.tajo.storage.parquet.TajoSchemaConverter.convert(TajoSchemaConverter.java:151) at org.apache.tajo.storage.parquet.TajoReadSupport.init(TajoReadSupport.java:77) at org.apache.tajo.storage.thirdparty.parquet.InternalParquetRecordReader.initialize(InternalParquetRecordReader.java:170) at org.apache.tajo.storage.thirdparty.parquet.ParquetReader.initReader(ParquetReader.java:161) at org.apache.tajo.storage.thirdparty.parquet.ParquetReader.read(ParquetReader.java:137) at org.apache.tajo.storage.parquet.ParquetScanner.next(ParquetScanner.java:91) at org.apache.tajo.storage.TestStorages.testNullHandlingTypesWithProjection(TestStorages.java:653) 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:497) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runners.Suite.runChild(Suite.java:128) at org.junit.runners.Suite.runChild(Suite.java:27) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:344) at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:269) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:240) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:184) at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:286) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:240) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:121)