GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/4519
[SQL][DataFrame] Fix column computability bug.
Do not recursively strip out projects. Only strip the first level project.
```scala
df("colA") + df("colB").as("colC")
```
Previously, the above would construct an invalid plan.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark computability
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/4519.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 #4519
----
commit 015c4fcb3e4250268cd0c1933d6c0c02a30ce0cc
Author: Reynold Xin <[email protected]>
Date: 2015-02-11T02:22:58Z
[SQL][DataFrame] Fix column computability.
Do not recursively strip out projects. Only strip the first level project.
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