GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/15892
[SPARK-18300][SQL] Do not apply foldable propagation with expand as a child
[BRANCH-2.0]
## What changes were proposed in this pull request?
The `FoldablePropagation` optimizer rule, pulls foldable values out from
under an `Expand`. This breaks the `Expand` in two ways:
- It rewrites the output attributes of the `Expand`. We explicitly define
output attributes for `Expand`, these are (unfortunately) considered as part of
the expressions of the `Expand` and can be rewritten.
- Expand can actually change the column (it will typically re-use the
attributes or the underlying plan). This means that we cannot safely propagate
the expressions from under an `Expand`.
This PR fixes this and (hopefully) other issues by explicitly whitelisting
allowed operators.
This is a backport of https://github.com/apache/spark/pull/15857
## How was this patch tested?
Added tests to `FoldablePropagationSuite` and to `SQLQueryTestSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-18300-branch-2.0
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15892.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 #15892
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commit 7911feb52bdaab4a9c1fa9ea04fe3c7e8cb4e2b9
Author: Herman van Hovell <[email protected]>
Date: 2016-11-15T22:08:39Z
Fix foldable propagation rule.
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