GitHub user sameeragarwal opened a pull request:
https://github.com/apache/spark/pull/11953
[SPARK-14137][SPARK-14150][SQL] Infer IsNotNull constraints from
non-nullable attributes
## What changes were proposed in this pull request?
This PR adds support for automatically inferring `IsNotNull` constraints
from any non-nullable attributes that are part of an operator's output. This
also fixes the issue that causes the optimizer to hit the maximum number of
iterations for certain queries in https://github.com/apache/spark/pull/11828.
## How was this patch tested?
Unit test in `ConstraintPropagationSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sameeragarwal/spark infer-isnotnull
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11953.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 #11953
----
commit 4142fc49a6e3d324645c9c015734479e00a2e4f5
Author: Sameer Agarwal <[email protected]>
Date: 2016-03-25T06:18:54Z
Infer IsNotNull constraints from non-nullable attributes
commit b630c17fdb0aadfb54292ff26b1553d624c73a8c
Author: Sameer Agarwal <[email protected]>
Date: 2016-03-25T06:38:14Z
unit test
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