Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11298#issuecomment-187005048
##### Issue 2: mixture of aliases and real columns in order by clause
```SQL
SELECT key as k, value as v, sum(value) FROM src GROUP BY key, value ORDER
BY k, value
```
```
== Parsed Logical Plan ==
'Sort ['k ASC,'value ASC], true
+- 'Aggregate ['key,'value], [unresolvedalias('key AS
k#47,None),unresolvedalias('value AS
v#48,None),unresolvedalias('sum('value),None)]
+- 'UnresolvedRelation `src`, None
```
In the above case, we need to replace the actual column name `value` by the
alias name `v`. Otherwise, we have to introduce `k` in all the nodes between
`Sort` and `Aggregate`.
```
Project [k#47,v#48,_c2#54L]
+- Sort [k#47 ASC,v#48 ASC], true
+- Aggregate [key#45,value#46], [key#45 AS k#47,value#46 AS
v#48,(sum(cast(value#46 as bigint)),mode=Complete,isDistinct=false) AS _c2#54L]
+- Subquery src
+- Project [_1#43 AS key#45,_2#44 AS value#46]
+- LocalRelation [_1#43,_2#44], [[1,1],[-1,1]]
```
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