Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19813
Which one is more common? A chain of arithmetic expressions? Or a deeply
nested expression? I don't see strong evidence that supports statement output
from the discussion. The only one possibility for now is to reducing code size.
This is also for performance, not stability. On the contrary, isn't using local
variable more stable? Don't forget we need to introduce other mechanism to fix
the problem of statement output like re-evaluation I pointed out above.
I'm not saying it is not good to support statement output. But for now, the
reason to support it is very vague.
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