GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/16027
Make sure CollapseWindow returns the attributes in the same order.
## What changes were proposed in this pull request?
The `CollapseWindow` optimizer rule changes the order of output attributes.
This modifies the output of the plan, which the optimizer cannot do. This also
breaks things like `collect()` for which we use a `RowEncoder` that assumes
that the output attributes of the executed plan are equal to those outputted by
the logical plan.
## How was this patch tested?
I have updated an incorrect test in `CollapseWindowSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-18604
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16027.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 #16027
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commit 53b91c83efd0b7d4dba00869dad098ecefbcfdb4
Author: Herman van Hovell <[email protected]>
Date: 2016-11-28T01:18:24Z
Make sure CollapseWindow returns the attributes in the same order.
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