0cce1a
@@ -79,6 +79,7 @@
protected void initializeOp(Configuration jobConf) throws HiveException {
     super.initializeOp(jobConf);
     hiveConf = jobConf;
     isMapOperator = conf.isMapSide();
+    currentKeys = null;
 
     reconstructQueryDef(hiveConf);
 
