Github user liancheng commented on the issue:
https://github.com/apache/spark/pull/17419
@WeichenXu123 and I did some profiling using `jvisualvm` and found that 40%
of the time is spent in the copy performed by [this `safeProjection`][1]. This
is a known issue used to fight against the false sharing issue @cloud-fan and I
hit before.
@cloud-fan tried to fix this issue in #15082 but that PR didn't work out
due to some other concerns (I can't remember all the details now).
@cloud-fan, any ideas about improving `ObjectHashAggregateExec` (e.g.
adding code generation support)?
[1]:
https://github.com/apache/spark/blob/03367d7aa3acd3abbcacba57ea75c8efa2a9a794/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/ObjectAggregationIterator.scala#L154
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