GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/11234
[SPARK-13354] [SQL] push filter throughout outer join
For a query
```
select * from a left outer join b on a.a = b.a where b.b > 10
```
The condition `b.b > 10` will filter out all the row that the b part of it
is empty.
In this case, we should use Inner join, and push down the filter into b.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark filter_outer
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11234.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 #11234
----
commit 7d87244a2bce20d891135ba64ee408bb5d23c6cd
Author: Davies Liu <[email protected]>
Date: 2016-02-17T05:36:29Z
push filter throughout outer join
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