GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/12794
[SPARK-15020][SQL] GROUP-BY should support Aliases
## What changes were proposed in this pull request?
`GROUP-BY` clauses raise **AnalysisException** for aliases while `ORDER-BY`
clauses support them correctly. This PR aims to support aliases in `GROUP-BY`
clause. This is one of frequently-used syntax to avoid unnecessary repetition.
```
scala> sql("select 1 a group by a").head
org.apache.spark.sql.AnalysisException: cannot resolve '`a`' given input
columns: []; line 1 pos 20
scala> sql("select 1 a order by a").head
res1: org.apache.spark.sql.Row = [1]
```
## How was this patch tested?
Pass the Jenkins tests (including a new testcase)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-15020
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12794.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 #12794
----
commit 71249cfeb9e798e41d8ef0f7423b48685a1774e7
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-04-29T23:17:05Z
[SPARK-15020][SQL] GROUP-BY should support Aliases
```
sql("select a x from values 1 T(a) group by x").explain
org.apache.spark.sql.AnalysisException: cannot resolve '`x`' given input
columns: [a]; line 1 pos 39
```
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