Description
The progress updater can invoke before RCFile.init()
2015-07-21 14:19:13,102 ERROR org.apache.tajo.worker.ExecutionBlockContext: java.lang.NullPointerException at org.apache.tajo.storage.rcfile.RCFile$RCFileScanner.getPosition(RCFile.java:1401) at org.apache.tajo.storage.rcfile.RCFile$RCFileScanner.getProgress(RCFile.java:1655) at org.apache.tajo.engine.planner.physical.SeqScanExec.getProgress(SeqScanExec.java:301) at org.apache.tajo.engine.planner.physical.UnaryPhysicalExec.getProgress(UnaryPhysicalExec.java:87) at org.apache.tajo.worker.TaskImpl.updateProgress(TaskImpl.java:305) at org.apache.tajo.worker.ExecutionBlockContext$Reporter$1.run(ExecutionBlockContext.java:409) at java.lang.Thread.run(Thread.java:745)