GitHub user aokolnychyi opened a pull request:
https://github.com/apache/spark/pull/14050
[MINOR][EXAMPLES] Window function examples
## What changes were proposed in this pull request?
An example that explains the usage of window functions.
It shows the difference between no/unbounded/bounded window frames and how
they are resolved.
The example also embraces 2 ways to define window frames: based on physical
(rowsBetween) and logical (rangeBetween) offsets.
The example should be useful for people who do not have much experience
with window functions since it explains how Spark internally deals with window
frames.
## How was this patch tested?
The existing tests were run, no failures. No additional test cases are
needed.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aokolnychyi/spark window_function_examples
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14050.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 #14050
commit fed17613e23c1634ae47542a00960dac77bc95fc
Author: aokolnychyi
Date: 2016-07-04T22:25:39Z
[MINOR][EXAMPLES] Window function examples
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