GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/18520
[SPARK-21295] [SQL] Use qualified names in error message for missing
references
### What changes were proposed in this pull request?
It is strange to see the following error message. Actually, the column is
from another table.
```
cannot resolve '`right.a`' given input columns: [a, c, d];
```
After the PR, the error message looks like
```
cannot resolve '`right.a`' given input columns: [left.a, right.c, right.d];
```
### How was this patch tested?
Added a test case
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark removeSQLConf
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18520.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 #18520
----
commit f3c722d5fac7ffb7d134dcd02ae2e7f4bf61ac85
Author: gatorsmile <[email protected]>
Date: 2017-07-04T00:31:27Z
fix
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