Github user nongli commented on the pull request:
https://github.com/apache/spark/pull/10116#issuecomment-161483289
I've attached two examples running different tpcds queries. For Q65 (the
bigger plan), we can see some useful things. Looking at the chain of 3
aggregations in the top middle, the first took 36.8 seconds to complete. This
includes all the time in the operators before. The next aggregation finished at
36.8 (meaning it is itself simple) and the third aggregation finished at 1 min.
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