GitHub user sameeragarwal opened a pull request:
https://github.com/apache/spark/pull/11618
[SPARK-13789] Infer additional constraints from attribute equality
## What changes were proposed in this pull request?
This PR adds support for inferring an additional set of data constraints
based on attribute equality. For e.g., if an operator has constraints of the
form (`a = 5`, `a = b`), we can now automatically infer an additional
constraint of the form `b = 5`
## How was this patch tested?
Tested that new constraints are properly inferred for filters (by adding a
new test) and equi-joins (by modifying an existing test)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sameeragarwal/spark infer-isequal-constraints
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11618.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 #11618
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commit 1149d200a712c339dd73f9038388ddcf9e66dad4
Author: Sameer Agarwal <sam...@databricks.com>
Date: 2016-03-09T23:44:11Z
Infer additional constraints from attribute equality
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