GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/11602
[SPARK-13771][SQL] Eliminate child from project if the project with no
references to its child
JIRA: https://issues.apache.org/jira/browse/SPARK-13771
## What changes were proposed in this pull request?
This is a corner case that a `Project` node can have no references to its
child. E.g.,
val input = LocalRelation('key.int, 'value.string)
Project(Literal(1).as("1") :: Nil, input)
We can actually replace the input with a dummy `OneRowRelation`.
This PR is inspired by #11599. The test case is slightly modified from
#11599 too.
## How was this patch tested?
`ColumnPruningSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 eliminate-no-use
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11602.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 #11602
----
commit 9500b461ee63504ddf393fe536da04c016ef4de1
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-03-09T07:57:01Z
Eliminate child from project if the project with no references to its child.
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