GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/14106
[SPARK-16448] RemoveAliasOnlyProject should not remove alias with metadata
## What changes were proposed in this pull request?
`Alias` with metadata is not a no-op and we should not strip it in
`RemoveAliasOnlyProject` rule.
This PR also did some improvement for this rule:
1. extend the semantic of `alias-only`. Now we allow the project list to be
partially aliased.
2. add unit test for this rule.
## How was this patch tested?
new `RemoveAliasOnlyProjectSuite`
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark bug
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14106.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 #14106
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commit cd3c128d6978ef43ce83067c56bf1bba99a4aa2c
Author: Wenchen Fan <[email protected]>
Date: 2016-07-08T16:39:07Z
improve RemoveAliasOnlyProject
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