GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/11198
[SPARK-13310] [SQL] Resolve Missing Sorting Columns in Generate
```scala
// case 1: missing sort columns are resolvable if join is true
sql("SELECT explode(a) AS val, b FROM data WHERE b < 2 order by val, c")
// case 2: missing sort columns are not resolvable if join is false. Thus,
issue an error message in this case
sql("SELECT explode(a) AS val FROM data order by val, c")
```
When sort columns are not in `Generate`, we can resolve them when `join` is
equal to `true`. Still trying to add more test cases for the other `UnaryNode`
types.
Could you review the changes? @davies @cloud-fan Thanks!
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark missingInSort
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11198.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 #11198
----
commit 0f4cbdced54349e5c3af8aa8b3dc509561700fe3
Author: gatorsmile <gatorsm...@gmail.com>
Date: 2016-02-14T00:37:31Z
resolve missing sorting columns in Generate
commit c74e7b911abc1e420f9d2bd775c7b02fb6cf3079
Author: gatorsmile <gatorsm...@gmail.com>
Date: 2016-02-14T00:48:41Z
style fix.
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