GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/11809
[SPARK-13995][SQL] Constraints should take care of Cast
## What changes were proposed in this pull request?
JIRA: https://issues.apache.org/jira/browse/SPARK-13995
We infer relative constraints from logical plan's expressions. However, we
don't consider `Cast` expression now.
For example:
val tr = LocalRelation('a.int, 'b.long)
val plan = tr.where('a.attr === 'b.attr).analyze
Then, the plan's constraints will have `IsNotNull(Cast(resolveColumn(tr,
"a"), LongType))`, instead of `IsNotNull(resolveColumn(tr, "a"))`.
## How was this patch tested?
Test is added into `ConstraintPropagationSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 constraint-cast
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11809.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 #11809
----
commit c2f9b058f6ad243e35518bc1758fe7ef7ac2c25f
Author: Liang-Chi Hsieh <sim...@tw.ibm.com>
Date: 2016-03-17T14:02:12Z
init import.
commit b4e60339f713590fdb7294ab735eaefbe1940501
Author: Liang-Chi Hsieh <sim...@tw.ibm.com>
Date: 2016-03-18T02:41:16Z
Add test.
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