Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21777
> Except the TPC-DS queries, are we able to find some workloads that could
perform faster using the bytecode generated by the JDK compiler?
Since I don't have real workloads or non-TPCDS queries, it is difficult for
me to find the workload.... can you? @kiszk
> Or, does that mean Janino compiler is always better than JDK compiler?
(that does not sound true to me)
No, I meant averaged performance.
I'm not a Java/JDK expert, so I don't completely understand how the two
compilers work. IIUC, these compilers might apply simple optimization a little
though, they simply convert Java code into bytecode? The hotspot has a
responsibility for optimization? Anyway, we'd be better to wait for other
developers.
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