GitHub user yjshen reopened a pull request:
https://github.com/apache/spark/pull/8742
[SPARK-10539][SQL]Fix set optimization by eliminate empty project list push
down
Push down empty project list through `Intersect` or `Except` would make all
the rows in both child to empty row, which makes set operation `intersect` or
`except` meaningless.
JIRA: https://issues.apache.org/jira/browse/SPARK-10539
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/yjshen/spark fix_set_optimization
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8742.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 #8742
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commit 040b60a980627f5d5c6cb21a61ba0758dea8cf29
Author: Yijie Shen <henry.yijies...@gmail.com>
Date: 2015-09-14T09:05:38Z
fix set optimization by eliminate empty project push down
commit ce6ed80f1d3b7138664010a415a8501ea68dcd28
Author: Yijie Shen <henry.yijies...@gmail.com>
Date: 2015-09-14T16:30:38Z
Project should not be pushed down through Intersect or Except
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