dongjoon-hyun commented on a change in pull request #634:
URL: https://github.com/apache/orc/pull/634#discussion_r564172470



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File path: 
java/mapreduce/src/test/org/apache/orc/mapred/TestOrcFileEvolution.java
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@@ -312,6 +314,26 @@ public void testPositional2() {
         false, addSarg, true);
   }
 
+  private void checkEvolutionPosn(String writerType, String readerType,

Review comment:
       This function seems to be duplicated mostly with `checkEvolution`. Is 
the only difference is the column name, `_col0` and `a`?




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