GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/861
[SPARK-1914] [SQL] Simplify CountFunction not to traverse to evaluate all
child expressions.
`CountFunction` should count up only if the child's evaluated value is not
null.
Because it traverses to evaluate all child expressions, even if the child
is null, it counts up if one of the all children is not null.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark issues/SPARK-1914
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/861.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 #861
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commit 2afa2386b0f59d1d50f11de2d444f191335867ef
Author: Takuya UESHIN <[email protected]>
Date: 2014-05-23T10:15:44Z
Simplify CountFunction not to traverse to evaluate all child expressions.
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