GitHub user huaxingao opened a pull request:
https://github.com/apache/spark/pull/22788
[SPARK-25769][SQL]change nested columns from `a.b` to `a`.`b`
## What changes were proposed in this pull request?
Currently, ```$"a.b".expr.asInstanceOf[UnresolvedAttribute].sql```
returns
```
res1: String = `a.b`
```
This PR will change the nested column to
```
`a`.`b`
```
## How was this patch tested?
I didn't add any new test. However, I changed several of the existing tests
to make them to expect the nested columns to have the format of
```
`a`.`b`
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/huaxingao/spark spark-25769
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22788.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 #22788
----
commit 2aa4ad97c8b9df5fdd022653549a0252dbb819b6
Author: Huaxin Gao <huaxing@...>
Date: 2018-10-21T16:13:49Z
[SPARK-25769][SQL]change nested columns from to .
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