GitHub user liancheng opened a pull request:
https://github.com/apache/spark/pull/12040
[SPARK-14244][SQL][WIP] Don't use SizeBasedWindowFunction.n created on
executor side when evaluating window functions
## What changes were proposed in this pull request?
`SizeBasedWindowFunction.n` is a global singleton attribute created for
evaluating size based aggregate window functions like `CUME_DIST`. However,
this attribute gets different expression IDs when created on both driver side
and executor side. This PR stops using `SizeBasedWindowFunction.n` created on
executor side.
## How was this patch tested?
TBD. Testing this bugfix requires starting a multi-process cluster. Trying
to figure out a proper way to test it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/liancheng/spark
spark-14244-fix-sized-window-function
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12040.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 #12040
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commit 65bc6ae8f614d67ec53e170d0f1ebf8b1a56516a
Author: Cheng Lian <l...@databricks.com>
Date: 2016-03-29T16:49:44Z
Reuses driver side created SizeBasedWindowFunction.n
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