GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/14713
[SPARK-16994][SQL] Whitelist operators for predicate push down
## What changes were proposed in this pull request?
This patch changes predicate push down optimization rule
(PushDownPredicate) from using a blacklist to a whitelist. That is to say,
operators must be explicitly allowed. This approach is more future-proof:
previously it was possible for us to introduce a new operator and then render
the optimization rule incorrect.
This also fixes the bug that previously we allow pushing filter beneath
limit, which was incorrect.
## How was this patch tested?
- a unit test case in FilterPushdownSuite
- an end-to-end test in limit.sql
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-16994
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14713.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 #14713
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commit 9be428a6a2a776ff4cdcc44648b32f2552bf11b6
Author: Reynold Xin <[email protected]>
Date: 2016-08-19T06:58:25Z
[SPARK-16994][SQL] Whitelist operators for predicate push down
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