GitHub user adrian-wang opened a pull request:
https://github.com/apache/spark/pull/3675
[SQL] sum and avg on empty table should always return null
So the optimizations are not valid. Also I think the optimization here is
rarely encounter, so removing them will not have influence on performance.
I'll create JIRA after jira is back. Can we merge #3445 before I add a
comparison test case from this?
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/adrian-wang/spark sumempty
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3675.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 #3675
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commit 42df76399a9f815ddd235273d32ebfaafcc7c2fe
Author: Daoyuan Wang <daoyuan.w...@intel.com>
Date: 2014-12-11T08:07:54Z
sum and avg on empty table should always return null
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