GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/11904
[SPARK-14085] [SQL] Star Expansion for Hash and Concat
#### What changes were proposed in this pull request?
This PR is to support star expansion in hash and concat. For example,
```SQL
val structDf = testData2.select("a", "b").as("record")
structDf.select(hash($"*")
structDf.select(concat($"*"))
```
In addition, it refactors the codes for the rule `ResolveStar` and fixes a
regression for star expansion in group by when using SQL API. For example,
```SQL
SELECT * FROM testData2 group by a, b
```
cc @cloud-fan Now, the code for star resolution is much cleaner. The
coverage is better. Could you check if this refactoring is good? Thanks!
#### How was this patch tested?
Added a few test cases to cover it.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark starResolution
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11904.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 #11904
----
commit c0551aaf0bb6c015762e5c84da41bc87743da010
Author: gatorsmile <[email protected]>
Date: 2016-03-22T22:34:58Z
star expansion
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