Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19813
Not all of expressions can use statement as output. Seems to me there are
only very few scenarios (e.g., a chain of expressions that all can use
statement output by coincidence) we can really save local variables. If we also
consider possible optimization of JIT, the benefit might be only marginal. That
is why I am not sure if it is necessary to consider statement output generally.
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