andygrove commented on issue #1123:
URL: 
https://github.com/apache/datafusion-comet/issues/1123#issuecomment-2512310887

   Update: The ScanExec time is from calling CometBatchIterator.next() so 
includes the time for it to fetch input batches as well as the FFI cost. It 
looks like the cost of fetching the batches is much more than the FFI cost. 
Perhaps this is really measuring the execution time of the input query, so 
could be misleading


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