Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/9480#issuecomment-154599464
>
I'm still not sure how you are suggesting we execute the version you are
proposing. I'd guess you do that by adding an additional project that creates a
new intermediate row and substitute the common subexpression to read from that
new intermediate row. I think this is bad for performance. One of the big
benefits of codegen is to remove those "unnecessary" intermediate rows.
>
I don't think I will do that in the way you described, actually we are
working on the common xxx elimination right now, probably more information will
be shared later, will ping you then.
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