GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/13087
[SPARK-15282][SQL] UDF funtion is not always deterministic and need to be
evaluated once.
## What changes were proposed in this pull request?
UDF functions might be non-deterministic and cost-expensive. We need to
evaluate once if they occurs one time. However, currently, `PushDownPredicate`
duplicated them if the children of UDF functions are deterministic.
## How was this patch tested?
Pass the Jenkins tests (include new testcase)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-15282
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13087.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13087
----
commit 43794e17357bf0b9ea2a6a2a1864eb73aac2d206
Author: Dongjoon Hyun <[email protected]>
Date: 2016-05-13T00:25:51Z
[SPARK-15282][SQL] UDF funtion is not always deterministic and need to be
evaluated once.
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