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src/org/apache/pig/backend/hadoop/executionengine/tez/CombinerOptimizer.java
<https://reviews.apache.org/r/15261/#comment55299>

    In this if-branch, is it not possible for currOp to also end in a POLocalRearrange, i.e. don't you want to check if you should set prevOp=currOp?
   
    In the case of Map-Reduce-Reduce (implemented as Tez vertices), would not the middle Reduce start with a POPackage but then itself end in a POLocalRearrange?
- Alex Bain
On Nov. 6, 2013, 3:55 p.m., Cheolsoo Park wrote: