Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19813
> What about future? Will we need to output statement for some reason? like
reducing the usage of local variables?
I think that we won't have strong motivation to use output statement. The
reason is, although it helps to reduce the usage of local variables (is it any
beneficial like reducing global variables?), it also means the chained
evaluation of expressions needs to be run at every occurrence.
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