Github user rxin commented on the issue:
https://github.com/apache/spark/pull/19222
Sorry this thread is too long for me to follow. I might be bringing up a
point that has been brought up before.
@kiszk did your perf tests take into account megamorphic callsites? It
seems to me from a quick cursory look the benchmark result might not be
accurate for real workloads if there are only one implementations of the
MemoryBlock loaded.
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