GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/12267
[SPARK-14502][SQL] Add optimization for Non-Nullable Binary Comparison
Simplification
## What changes were proposed in this pull request?
For non-nullable binary comparisons, we can simplifies `semantically-equal
expressions` further:
- Replace '=', '<=', and '>=' with 'true' literal
- Replace '<' and '>' with 'false' literal
For example, the following example plan
```
scala> sql("SELECT * FROM (SELECT explode(array(1,2,3)) a) T WHERE a
BETWEEN a AND a+7").explain()
...
: +- Filter ((a#59 >= a#59) && (a#59 <= (a#59 + 7)))
...
```
will be optimized into the following.
```
: +- Filter (a#47 <= (a#47 + 7))
```
## How was this patch tested?
Pass the Jenkins tests including new
`NonNullableBinaryComparisonSimplificationSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-14502
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12267.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 #12267
----
commit 69fadfef81714adf34b346c9c56aed35d4d37ae1
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-04-08T22:51:11Z
[SPARK-14502][SQL] Add optimization for Non-Nullable Binary Comparison
Simplification
----
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