Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19860
I'm not sure if I currently follow this. For example, Coalesce, doesn't
guarantee the later functions won't be called by the conditions of
ev.isNull? Why we need to apply this do loop?
On Dec 3, 2017 2:30 AM, "Marco Gaido" <[email protected]> wrote:
> @kiszk <https://github.com/kiszk> of course it depends on each specific
> case, on average after this PR we use only 50% of the function calls. Thus
> on average the overhead caused by the many function calls is reduced by
50%.
>
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