Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/19865
I think we have to guarantee this. The case you are dealing with is a wrong
situation that should be avoided. Indeed, in such a case, it is not even clear
to me which is the right thing to do: I mean, which was the intention? Was it
to use the global variable or was it to use the passed argument?
Here you are assuming that the intention was to use the global variable,
which actually is an interpretation I would question, since up to me the right
thing to do is to use the passed variable as Java does on his own, because
anybody creating this situation hopefully knows as Java works, thus he/she
might also rely on that.
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