Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/1101#discussion_r165566070
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/aggregate/HashAggTemplate.java
 ---
    @@ -956,21 +925,8 @@ private void spillAPartition(int part) {
           this.htables[part].outputKeys(currOutBatchIndex, this.outContainer, 
outStartIdxHolder.value, outNumRecordsHolder.value, numPendingOutput);
     
           // set the value count for outgoing batch value vectors
    -      /* int i = 0; */
           for (VectorWrapper<?> v : outgoing) {
             v.getValueVector().getMutator().setValueCount(numOutputRecords);
    -        /*
    --- End diff --
    
    See the `RowSet` classes. Chunhui and others have successfully used these 
to print bathes for debugging. Roughly:
    
    ```
    RowSet rs = DirectRowSet.fromContainer(container);
    rs.print();
    ```
    
    This can be modified to take a row range (to avoid, say, printing 64K 
rows.) There are versions to do the printing using an SV2 or SV4.
    
    In the code I've not yet posted is a utility to print the contents of an 
offset vector. Very handy when your offsets get messed up.


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