Github user rajeshbalamohan commented on the pull request:
https://github.com/apache/spark/pull/10825#issuecomment-173037438
getCallSite gets the thread stack trace (+ additional processing). This is
executed numerous number of times when running a query on TPC-DS (with 1800+
partition files) dataset. I have attached the profiler info in SPARK-12898
(https://issues.apache.org/jira/secure/attachment/12783232/callsiteProf.png).
Having dummycallsite eliminates these stracktrace calls and reduces the overall
job runtime.
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