GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/12986
[SPARK-15211][SQL] Select features column from LibSVMRelation causes failure
## What changes were proposed in this pull request?
We need to use `requiredSchema` in `LibSVMRelation` to project the fetch
required columns when loading data from this data source. Otherwise, when users
try to select `features` column, it will cause failure.
## How was this patch tested?
`LibSVMRelationSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 fix-libsvmrelation
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12986.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 #12986
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commit f15e461b55270d460d83fccca1572ed804259203
Author: Liang-Chi Hsieh <[email protected]>
Date: 2016-05-08T09:15:35Z
Output required columns in LibSVMRelation.
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