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 <tiandiwo...@icloud.com> wrote: > 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. >
