GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/18652
[WIP] Pull non-deterministic conditions from Join operator if possible
## What changes were proposed in this pull request?
Currently we can't use non-deterministic conditions in Join operator.
However, under certain scenarios, we may be able to pull non-deterministic
conditions from Join operator.
Related discussion:
1. https://github.com/apache/spark/pull/15417#discussion_r85295977
2.
http://apache-spark-developers-list.1001551.n3.nabble.com/SQL-Syntax-quot-case-when-quot-doesn-t-be-supported-in-JOIN-tc21953.html#a21973
## How was this patch tested?
Added unit test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 nondeter-join
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18652.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 #18652
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commit ef5394027b0033a772757497d79ac0c04ccf37e0
Author: Liang-Chi Hsieh <[email protected]>
Date: 2017-07-17T07:46:54Z
Pull non-deterministic conditions from Join operator if possible.
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