GitHub user windpiger opened a pull request:
https://github.com/apache/spark/pull/16956
[SPARK-19598][SQL]Remove the alias parameter in UnresolvedRelation
## What changes were proposed in this pull request?
Remove the alias parameter in `UnresolvedRelation`, and use `SubqueryAlias`
to replace it.
This can simplify some `match case` situations.
For example, the broadcast hint pull request can have one fewer case
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveHints.scala#L57-L61
## How was this patch tested?
add some unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/windpiger/spark removeUnresolveTableAlias
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16956.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 #16956
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commit 94084bdca9870b3c7a2ea947dd6bfaa011de3c36
Author: windpiger <song...@outlook.com>
Date: 2017-02-16T14:11:45Z
[SPARK-19598][SQL]remove the alias parameter in UnresolvedRelation
commit 4023727176b9ea548143d3e03b8b2a524436314c
Author: windpiger <song...@outlook.com>
Date: 2017-02-16T14:20:30Z
fix a bug
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