kennknowles commented on issue #30498:
URL: https://github.com/apache/beam/issues/30498#issuecomment-2038130587

   First step is I want to figure out if it is a Beam bug or a Calcite bug. I 
expect it to be a Beam bug. A likely source of the problem would be something 
like 
https://github.com/apache/beam/blob/master/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/impl/rule/BeamAggregateProjectMergeRule.java
   
   This is a rule that merges aggregation and projects, which seems to be what 
happens here. We have our own version of the rule because Beam has special 
projection pushdown into IOs. Just as an example of how I am thinking about 
debugging this. I will now read that file and report back if I see anything 
obvious.


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