GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/18956
[SPARK-21726][SQL] Check for structural integrity of the plan in Optimzer
in test mode.
## What changes were proposed in this pull request?
We have many optimization rules now in `Optimzer`. Right now we don't have
any checks in the optimizer to check for the structural integrity of the plan
(e.g. resolved). When debugging, it is difficult to identify which rules return
invalid plans.
It would be great if in test mode, we can check whether a plan is still
resolved after the execution of each rule, so we can catch rules that return
invalid plans.
## How was this patch tested?
Added tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 SPARK-21726
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18956.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 #18956
----
commit 21d86bac80790d0b994df79b5e27a7d2d354e90f
Author: Liang-Chi Hsieh <[email protected]>
Date: 2017-08-16T04:53:49Z
Check for structural integrity of the plan in Optimzer in test mode.
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