viirya commented on issue #1092:
URL: 
https://github.com/apache/datafusion-comet/issues/1092#issuecomment-2480047198

   > After analyzing the query optimization, I've found that the 
EliminateRedundantTransitions rule, removed a CometSparkToColumnar and 
subsequent ColumnarToRow following the  BatchScan (20) operator, due to the 
subsequent Filter (21) operator requiring row format.
   
   Removing CometSparkToColumnar + ColumnarToRow from the top of BatchScan (20) 
looks correct if the Filter (21) cannot be converted to CometFilter.
   
   > In the following example, we see that there is a missing ColumnarToRow 
preceding the Project (19) operator. This results in the query failing.
   
   I'm not sure if it is related to the issue on Project (19)?
   


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