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From 汪洋 <>
Subject Re: problem with reading source code-pull out nondeterministic expresssions
Date Thu, 31 Dec 2015 15:06:07 GMT
I get it, thanks!

> 在 2015年12月31日,上午3:00,Michael Armbrust <>
> The goal here is to ensure that the non-deterministic value is evaluated only once, so
the result won't change for a given row (i.e. when sorting).
> On Tue, Dec 29, 2015 at 10:57 PM, 汪洋 < <>>
> Hi fellas,
> I am new to spark and I have a newbie question. I am currently reading the source code
in spark sql catalyst analyzer. I not quite understand the partial function in PullOutNondeterministric.
What does it mean by "pull out”? Why do we have to do the "pulling out”?
> I would really appreciate it if somebody explain it to me. 
> Thanks. 

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