GitHub user gatorsmile opened a pull request:
https://github.com/apache/spark/pull/11682
[SPARK-13840] [SQL] Disable Project Pushdown Through Filter
#### What changes were proposed in this pull request?
Before this PR, two Optimizer rules `ColumnPruning` and
`PushPredicateThroughProject` reverse each other's effects. Optimizer always
reaches the max iteration when optimizing some queries. Thus, we need to
disable `Project` push down through `Filter` in the rule `columnPruning`.
The issue becomes worse when having another rule `NullFiltering`, which
could add extra Filters for `IsNotNull`. We have to be careful when introducing
extra `Filter` if the benefit is not large enough. cc @sameeragarwal @marmbrus
In addition, `ColumnPruning` should not push `Project` through
non-deterministic `Filter`. This could cause wrong results.
cc @davies @cloud-fan @yhuai
#### How was this patch tested?
Modified the existing test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gatorsmile/spark viewDuplicateNames
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11682.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 #11682
----
commit e128a0a3d23b7a6a37cdc77034a651d79e32c451
Author: gatorsmile <[email protected]>
Date: 2016-03-13T02:00:04Z
Disable Project Push Down Through Filter
----
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
