GitHub user ConeyLiu opened a pull request:
https://github.com/apache/spark/pull/19511
[SPARK-22293][SQL] Avoid unnecessary traversal in ResolveReferences
## What changes were proposed in this pull request?
We don't need traverse the children expression to determine whether there
is an `Star` when expand `Star` expression.
## How was this patch tested?
Existing UT.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ConeyLiu/spark resolveReferences
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19511.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 #19511
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commit c58b3c0da49b4660affd386bae37fa6b5c9b3567
Author: Xianyang Liu <[email protected]>
Date: 2017-10-17T06:29:02Z
Avoid unnecessary traversal
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