FelixYBW commented on PR #10787:
URL: 
https://github.com/apache/incubator-gluten/pull/10787#issuecomment-3324936545

   data source add split time counts the time to add a split to table scan in 
main thread. The split may or may not be prefetched.
   
   data source read time counts the time to read a page from parquet in table 
scan in main thread. The page may or maynot be prefetched. it count the 
decompress time as well. It doesn't count the time for lazy read. Lazy read is 
counted in following operators or when we do flatten.
   


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