GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/5134
[SPARK-6466][SQL] Remove unnecessary attributes when resolving GroupingSets
When resolving `GroupingSets`, we currently list all outputs of
`GroupingSets`'s child plan. However, the columns that are not in groupBy
expressions and not used by aggregation expressions are unnecessary and can be
removed.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 remove_attr_expand
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/5134.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 #5134
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commit 8e16206aa7b8ece8521a64bfabdafbe925ce8e75
Author: Liang-Chi Hsieh <vii...@gmail.com>
Date: 2015-03-23T09:58:54Z
Only keep necessary attribute output.
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