GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/11722
[SPARK-13903][SQL] Modify output nullability with constraints for Join
operator
## What changes were proposed in this pull request?
JIRA: https://issues.apache.org/jira/browse/SPARK-13903
With constraints and optimization, we can make sure some outputs of a Join
operator are not nulls. We should modify output nullability accordingly. We can
use this information in later execution to avoid null checking.
## How was this patch tested?
Modified `NullFilteringSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 output-nullable-with-constraint
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11722.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 #11722
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commit fb6c8cd182dae1aded07baf59cb185f1afde84e7
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-03-15T09:01:04Z
Modify output nullable with constraint for Join.
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