GitHub user sameeragarwal opened a pull request:
https://github.com/apache/spark/pull/11594
[SPARK-13759][SQL] Add IsNotNull constraints for expressions with an
inequality
## What changes were proposed in this pull request?
This PR adds support for adding `IsNotNull` constraints from expressions
with an `!==`. More specifically, if an operator has a condition on `a !== b`,
we know that both `a` and `b` in the operator output can no longer be null.
## How was this patch tested?
1. Modified a test in `ConstraintPropagationSuite` to test for expressions
with an inequality.
2. Added a test in `NullFilteringSuite` for making sure an Inner join with
a "non-equal" condition appropriately filters out null from their input.
cc @nongli
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sameeragarwal/spark isnotequal-constraints
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11594.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 #11594
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commit 21a9250e1266f3badbcc4b95bf2e7d276c22c5df
Author: Sameer Agarwal <sam...@databricks.com>
Date: 2016-03-09T01:45:20Z
Add IsNotNull constraints for !==
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