Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13663
IIUC, this PR adds a global variable to eliminate some if branches that are
very easy to be optimized by javac or JIT.
I think this is not a good tradeoff, the readability of the scala code is
much more important than the readability(or code size) of the generated java
code.
cc @davies
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