Zouxxyy commented on PR #11264:
URL: 
https://github.com/apache/incubator-gluten/pull/11264#issuecomment-3639922082

   > So then root cause is that Velox's AggregationNode can't use a single 
grouping set to simulate multiple groups as below
   > 
   > ```
   > 
[groupings[0].key[0],groupings[0].key[1],groupings[1].key[0],groupings[1].key[1]]
   > ```
   > 
   > we have to implement multiple groups support in AggregationNode.
   > 
   > Right?
   
   Yes, it only accept
   
   ```
   
[groupings[0].key[0],groupings[0].key[1],groupings[0].key[2],groupings[0].key[3]]
   ```
   
   BTY, in the case of multiple groups, the aggregates functions also need to 
be a list of list.


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