Github user rxin commented on the issue:
https://github.com/apache/spark/pull/13439
What I meant is that if in one process you have some invocation of the
function that would hit the true branch, and some other invocation of the
function that would hit the false branch, the performance is going to be worse.
Google "branch prediction" for more information.
Basically you can't measure the overhead of an extra branch in practice by
running a benchmark in which the flag is either always false or always true.
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