Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/15412
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GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/15412
[SPARK-17844] Simplify DataFrame API for defining frame boundaries in
window functions
## What changes were proposed in this pull request?
When I was creating the example code for SPARK-10496, I
