GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/17432
[SPARK-20086][SQL] CollapseWindow should not collapse dependent adjacent
windows
## What changes were proposed in this pull request?
The `CollapseWindow` is currently to aggressive when collapsing adjacent
windows. It also collapses windows in the which the parent produces a column
that is consumed by the child; this creates an invalid window which will fail
at runtime.
This PR fixes this by adding a check for dependent adjacent windows to the
`CollapseWindow` rule.
## How was this patch tested?
Added a new test case to `CollapseWindowSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-20086
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17432.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 #17432
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commit 500c26f55787dccc394896a2e8d646666239564e
Author: Herman van Hovell <[email protected]>
Date: 2017-03-26T07:47:28Z
CollapseWindow rule should respect dependencies between adjacent windows.
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