Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18931
Ran with `aggregate with randomized keys` benchmark in `AggregateBenchmark`
to know if it will bring performance regression for the cases of no long
generated function.
Before this patch:
Java HotSpot(TM) 64-Bit Server VM 1.8.0_102-b14 on Linux 4.9.36-moby
Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
Aggregate w keys: Best/Avg Time(ms) Rate(M/s)
Per Row(ns) Relative
------------------------------------------------------------------------------------------------
codegen = F 8817 / 8853 9.5
105.1 1.0X
codegen = T hashmap = F 4904 / 4999 17.1
58.5 1.8X
codegen = T hashmap = T 2040 / 2256 41.1
24.3 4.3X
After this patch:
Java HotSpot(TM) 64-Bit Server VM 1.8.0_102-b14 on Linux 4.9.36-moby
Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
Aggregate w keys: Best/Avg Time(ms) Rate(M/s)
Per Row(ns) Relative
------------------------------------------------------------------------------------------------
codegen = F 8347 / 8388 10.1
99.5 1.0X
codegen = T hashmap = F 5112 / 5146 16.4
60.9 1.6X
codegen = T hashmap = T 2008 / 2365 41.8
23.9 4.2X
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