Github user jinfengni commented on a diff in the pull request:

    https://github.com/apache/drill/pull/704#discussion_r109051934
  
    --- Diff: exec/vector/src/main/codegen/templates/NullableValueVectors.java 
---
    @@ -374,6 +374,19 @@ public void copyFromSafe(int fromIndex, int thisIndex, 
Nullable${minor.class}Vec
         values.copyFromSafe(fromIndex, thisIndex, from.values);
       }
     
    +  @Override
    +  public void copyEntry(int toIndex, ValueVector from, int fromIndex) {
    +    Nullable${minor.class}Vector fromVector = 
(Nullable${minor.class}Vector) from;
    +    <#if type.major == "VarLen">
    +
    +    // This method is to be called only for loading the vector
    --- End diff --
    
    Will it make sense to put this comment as part of java doc for this 
copyEntry() method, so that people knows this method should be called 
sequentially ? 


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