GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/18772
[SPARK-20963][SQL] Support column aliases for join relations in FROM clause
## What changes were proposed in this pull request?
This pr added parsing rules to support column aliases for join relations in
FROM clause.
This pr is a sub-task of #18079.
## How was this patch tested?
Added tests in `AnalysisSuite`, `PlanParserSuite,` and `SQLQueryTestSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-20963-2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18772.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 #18772
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commit 6c93f859b7ef2cc7f7cb49ab6fbd0397b43fda84
Author: Takeshi Yamamuro <yamam...@apache.org>
Date: 2017-07-24T09:08:11Z
Support aliases for join relations
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